AP SSC 10th Class Physical Science Chapter 3 Solution – Reflection of light by different surfaces

AP SSC 10th Class Physical Science Chapter 3 Solution – Reflection of light by different surfaces

Andhra Pradesh SSC 10th Class Physical Science Chapter 3 Reflection of light by different surfaces Solution for AP SSC 10th Class Physics/Chemistry Exam. Lots of Students of Andhra Pradesh Board will search on internet for Andhra Pradesh Class 10 Physical Science Textbook Solution or Study Material for AP SSC 10th exam. Here you search will end! Here in this page we have provided for all question answer for Chapter 3 Reflection of light by different surfaces.

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AP 10th Class Physics Chapter 3 Reflection of light by different surfaces Solution

(1) State the laws of reflection of light. (AS1)

Ans: Laws of reflection of light is when light falls upon any object surface then the angle of reflection is equal to the angle of incidence.

(2) How do you find the focal length of a concave mirror? (AS1)

Ans: For finding out the length of the concave mirror the mirror and the screen should be at the same height. The distance between the pole and the converging point of parallel rays is called the focal length.

(3) Where will the image form when we place an object, on the principal axis of a concave mirror at a point between focus and centre of curvature? (AS1)

Ans: If an object is placed on the principal axis of a concave mirror at point between focus and centre of curvature then the image will form beyond the centre of curvature.

(4) Find the distance of the image when an object is placed on the principal axis at a distance of 10cm in front of a concave mirror whose radius of curvature is 8 cm. (AS1)

Ans: –we know the mirror formula, 1/u +1/v = 1/f

From the question we get, u=-10cm; R= 8cm, R=2f then f= -4cm

1/v -1/10=1/-4. Or v= -20/3 cm.

 

(5) State the differences between convex and concave mirrors. (AS1)

Ans: In a convex mirror the image always is virtual and erect. But in a concave mirror, the image always is virtual.

 

(6) Distinguish between real and virtual images. (AS1)

Ans: The virtual image is formed because of the intersection of imaginary light whereas real images are formed as a result of the actual intersection of light.

 

(7) How do you get a virtual image using a concave mirror? (AS1)

Ans: In a concave mirror if an objective is kept between the pole and focus then which image is formed are called a virtual image.

 

(8) What do you know about the terms given below related to spherical mirrors? (AS1)

(a) Pole (b) Centre of curvature (c) Focus
(d) Radius of curvature (e) Focal length. (f) Principal axis
(g) Object distance (h) Image distance (i) Magnification

 

Ans: –(a) Pole: – Pole lies on the mirror surface. It’s called the spherical mirror reflecting surface centre.

(b) Centre of curvature: – It is the centre of the spherical mirror.

(c) Focus: – After reflection where the parallel lines meet on the principal axis is called the focus.

(d) Radius of curvature: – The distance between the pole and centre of curvature of a spherical mirror is called the radius of curvature.

(e) Focal length: – The distance between the pole and focus of a spherical mirror is called the focal length.

(f) Principal axis: – The lines which it passes through the centre of a spherical mirror is called the principal axis.

(g) Object distance: – The total distance between where the object is situated and the pole of the mirror is the object distance.

(h) Image distance:-The distance from where the image formed and the Pole of a spherical mirror is called the image distance.

(i) Magnification: – The negative ratio of image and object distance of a spherical mirror is called the magnification of a mirror.

 

(9) Write the rules for sign convention. (AS1)

Ans: –When we measure distance along in the direction of incident light are always taken positive and the opposite of the direction we must take negatively.

 

(10) The magnification produced by a plane mirror is +1. What does this mean? (AS1)

Ans: –For the value of magnification +1 we concluded that the image will be virtual and erect as well as the same object.

 

(11) Imagine that spherical mirrors were not known to human beings. Guess the consequences.(AS2)

Ans: –If the spherical mirror were unknown to the people then there will be very much effect on hospitality, rare view, microscopic. Especially the use of concave and concave mirror was unknown to us.

 

(12) By observing steel vessels and different images in them; Surya, a third class student, asked his elder sister Vidya some questions. What may be those questions? (AS2)

Ans: –The expected questions that may be asked by Suriya to his sister is the image which seen in the vessel is called what, why the image is inverted, why there are different sizes of different objects.

13) How do you verify the 1st law of reflection of light with an experiment? (AS3)

Ans: –With the help of laser light when we make it incident through the plane mirror, we can see that the reflected ray, incident ray and normal rays all are in the same plane. So by this incident, we verify the 1st law of reflection of light.

(14) How do you verify the 2nd law of reflection of light with an experiment? (AS3)

Ans:- At the first draw, a straight line AB from that draw a normal OM on it then make line XO which is at an angle to normal at O and after that, you will find an image of it on another side mirror named it OX’ . Therefore you will get the angle made by OX and OX’ are equal which is incident and reflected angle.

(15) What do you infer from the experiment which you did with concave mirrors and measured the distance of object and distance of image? (AS3)

Ans: –With the help of the experiment of the concave mirror we infer that concave mirror always formed real and virtual images.

(16) Find the plane of the reflection experimentally for the incident ray which passes through the heads of the pins pierced in front of the mirror. (AS3)

Ans: –For the finding of plane reflection we need a mirror strip, drawing board, pencil, pin, clamps, white paper etc.

 

(17) Collect information about the history of spherical mirrors in human civilization. Display it in your classroom. (AS4)

Ans: –At an early stage when mirrors manufactured were polished stone prices. The Chinese made the mirror in 500AD with the help of silver-mercury amalgam. Ptolemy also did many experimentson the iron polished mirror at that time.

(18) Think about the objects which act as a concave or convex mirror in your surroundings. Make a table and display it in your classroom. (AS4)

Ans:-The concave mirror uses in our daily life are headlights of different vehicles, shaving mirrors, the mirror used by dentists. And the convex mirror is rare view mirror, streetlights, glass water surfaces.

 

(19) How will our image be in concave and convex mirrors? Collect photographs and display in your classroom. (AS4)

Ans: –In a concave mirror our image will show inverted when we are at some distance from the mirror but in a convex mirror our image will show small in size and upright located at the focal point.

(20) Draw and explain the process of formation of image with a pinhole camera? (AS5)

Ans:

The camera of the pinhole are simple but no lenses in there. The box is lightproof and kept in a dark room, a small hole at one side of it. When the light passes through a hole an inverted image will form on the opposite side of the box.

(21) Draw suitable rays by which we can guess the position of the image formed by a concave mirror.

(AS5)

Ans: –The rays which are parallel to the principal axis will be reflected and the rays will pass through the focus of the concave mirror.

(22) Show the formation of image with a ray diagram when an object is placed on the principal axis of a concave mirror away from the centre of curvature. (AS5)

Ans:

The image of the objet away from the centre of curvature will be formed on the focus of the principal axis of a concave mirror.

 

(23) Make a solar heater/cooker and explain the process of making. (AS5)

Ans: –The process for making a solar heater is-

  • Using wood or iron make a TV-like dish.
  • Make 8 to 12 prices of mirrors like the isosceles triangle according to the radius of the dishes.
  • The circumference of the dishes would be made by 8 to 12 triangle bases.

 

(24) To form the image on the object itself, how should we place the object in front of a concave mirror? Explain with a ray diagram. (AS5)

Ans:-

(1) An object PQ must be placed on the centre of curvature of a concave mirror.

(2) The ray PS, parallel to the principal axis will be passed through the focus of the principal axis.

 

(25) How do you appreciated the role of spherical mirrors in daily life? (AS6)

Ans: –There are various uses of the spherical mirror in our daily life like a concave mirror used in the headlight of vehicle, convex mirror used to see rare view image of any object.

 

(26) How do you appreciate the use of reflection of light by a concave mirror in making of TV antenna dishes? (AS6)

Ans: –The main use of a concave mirror in the TV antenna is to focus the light ray to a single point. As the concave mirror helps to form light at one single point.

 

(27) Have you ever observed the image of the sky in rain water pools on earth? Explain the reflectionof light in this context. (AS6)

Ans: –The rainwater surface always formed a concave mirror. When the sunlight came to it reflected by its surface as a result of that the images of the sky become diminished and sometimes inverted.

 

(28) Discuss the merits and demerits of using mirrors in building elevation. (AS7)

Ans: –If we cover any building with a mirror it always reflect light as a result the interior of the building be cooled. But day by the increased price of mirror become demerit s of it’s used.

 

(29) Why do we prefer a convex mirror as a rear-view mirror in the vehicles? (AS7)

Ans: –As the convex mirror always produces the virtual, erect and diminished image of any image in front of it, it gives us a wide view of the object it uses in the rearview mirror.

 

(30) A convex mirror with a radius of curvature of 3m is used as rear view in an automobile. If a bus is located at 5m from this mirror, find the position, nature and size of the image. (AS7)

Ans: –R= +3.So f= R/2 or f= +3/2

We know that 1/v +1/u =1/f

By putting the value of u=-5; f=3/2

1/ v=1/5 + 2/3=13/15

V= 1.15

And. M= – (v/u) = 3/13

So we came to this conclusion that the image is virtual, erect and diminished.

 

(31) An object is placed at a distance of 10cm from a convex mirror of focal length 15cm. Find the

Position and nature of the image. (AS7)

Ans: –From the mirror formula we can write, 1/v +1/u =1/f

Here u=-10cm and f=15cm

Then 1/v=1/10 + 1/15 =25/150

V = 6cm

The image will be virtual and would be formed at 6cmm beyond the mirror.

 

FILL IN THE BLANKS

(1) The centre of sphere to which a spherical mirror belongs, is called…. centre of curvature…………

 

(2) The geometric centre of the mirror is ….pole………..

 

(3) The line which passes through the centre of curvature and pole is … principal axis of the mirror………..

 

(4) The rays which are parallel to the principal axis of a concave mirror on reflection, meet at__focus.

 

(5) The distance between pole and centre of curvature is ….radius of curvature……….

 

(6) The distance between pole and focus is …….focal length……

 

(7) The relation between focal length and radius of curvature is given by ……f=R/2…..

 

(8) The relation between the angle of incidence and angle of reflection is given by .0r =0i…..

 

(9) Light selects the least time path to travel between two points. This principle was stated by___fermats principal___

 

(10) The equation of mirror formula is. 1/v +1/u =1/f…………..

 

MULMULTIPLE-CHOICEESTIONS

(1) If an object is placed at C on the principal axis in front of a concave mirror, the position of the image is……. (c) at C.

 

(2) We get a diminished image with a concave mirror when the object is placed … (d)….beyond c

 

(3) We get a virtual image in a concave mirror when the object is placed…. (b) between the pole and F

 

(4) Magnification m =…….. (d) hi/ho

 

(5) A ray which seems to be travelling through the focus of a convex mirror passes…… (a) parallel to the axis………………after reflection.

Updated: November 12, 2021 — 1:02 pm

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