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CBSE - Light Refraction
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Practice Question
Light Refraction
.
Light Refraction
You are provided with a concave lens having focal length 15 cm. If it diminishes the image by one-third, calculate the distance of image from lens?
(1) 5 cm
(2) 10 cm
(3) 5 m
(4) 10 m
Correct Answer: 1
.
Related Questions
Light Refraction
1
A convex lens of suitable focal length can correct man' s eye problem of
(1) Short sightedness
(2) Long sightedness
(3) Presbyopia
(4) Astigmatism
Correct Answer: 2
2
A student was asked to draw a ray diagram for formation of image by convex lens for the following positions the object :
(A) between F and 2F
(B) at F
(C) at 2F
(D) between F and optical centre
The position for which virtual image can be formed among these is -
(1) B
(2) A
(3) C
(4) D
Correct Answer: 4
3
A lens have power +5D. This lens will be
(1) a convex lens of focal length 0.05 m.
(2) a concave lens of focal length 0.20 m.
(3) a convex lens of f ocal lengt h 0. 20 m
(4) a concave lens of focal length 0.05 m
Correct Answer: 3
4
The refractive index of glass is maximum for
(1) red colour
(2) yellow colour
(3) violet colour
(4) green colour
Correct Answer: 3
5
A light ray enters from denser medium to rarer medium. What is the angle of incidence called that has 90° angle of refraction?
(1) angle of refraction
(2) critical angle
(3) angle of deviation
(4) angle of reflection
Correct Answer: 2
