Refraction Through a Lens Class 10 ICSE Physics MCQ Questions
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(1) A beam of light converges in
a) convex lens
b) concave lens
c) Prism
d) equiconcave lens
Ans-option (a)
02) which lens is deverging
a) convexo-concave lens
b) equi- concave lens
c) equi -convex lens
d) Both (a) & (b)
Ans- Option (d)
3) The medium on both side of a lens is same then
a) first and second focal length is not equal
b) First and second focal length are equal
c) first focal length is greater than second focal length
d) first focal length is less than second focal length.
Ans-option (b)
4) The lens is placed in water its focal length
a) decrease b) equal
c) increase
d)None of these
Ans-option (c)
5) The focal length do not depend on
a)refractive index
b) radii of curvature
c) Direction of light
d) Both (a) & (b)
Ans- option (c)
6) The image of an object formed by concave lens is
a) virtual b) real
c) erect d) Both (a)&(c)
Ans-option(d)
7) For the object is placed between the optical centre & focus of
a convex lens the image is
a) virtual & magnified
b) virtual & diminshed
c) real & magnified
d)real & diminished
Ans-option (a)
8) For the object placed at a very large distance
of a concave lens, the image is
a) real & diminished
b) real & enlarged
c) virtual & diminished
d) virtual & enlarged Ans-option (c)
9) A patient of hypermetropia is given spectacles of
a)concave lens
b) canvex lens
c) compound lens
d)lens of zero capacity
Ans-option (b)
10) which one of following can be used to formed virtual & magnified image of an object
a) convex lens
b) concave lens
c) Compound lens
d) Both (a) & (b)
Ans-option (a)
11) According to sign convention, the focal length of concave lens is
a) positive
b) negative
c) zero
d) one
Ans-option (b)
12) When magnification is positive then image is
a) Virtual
b) real
c)inverted
d) Both (b) & (c)
Ans-option (a)
13) when a ray deviates toward the centre, the power is
a) positive b) negative
c) zero. d) large
Ans- option (a)
14) An object is placed at distance of 20cm in front of concave lens of focal length 20cm .find position of image
a) -20cm
b) 20 cm
c) -10cm
d)10cm
Ans- option(c)
u= 20 cm (negative)
f = 20cm (negative)
1/v-1/u =1/f
=1/v= 1/u +1/f
=1/-20 + 1/-20 = -1/10
v=-10cm
15) The distance of object in front of lens is always
a) positive b) virtual
c) zero. d) negative
Ans-option (d)
16) A convex lens has focal length of 50 cm. find it’s power is
a) 2D b) 4D c) 5D d) 9D
Ans-option (a)
f = 50cm= 0.5m
power = 1/f = 1/0.5 =2D
17) Which of following is used as magnifying glass .
a) diverging lens
b) concave lens
c) plane mirror
d) converging lens
Ans-Option (d)
18) The correct magnifying power formula is
a) 1+f/D. b) 1+D/f
c) 1-D/f d) 1-f/D
Ans-option (b)
19) A simple microscope forms
a) virtual image
b) inverted image
c)real image
d) no image
Ans-option (a)
20) when lens is thick in middle and thin at edges then lens is
a) concave
b) convex
c) simple microscope
d) Both (a) & (b)
Ans-option (b)
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