# Chapter 10: Light Reflection and Refraction

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## Chapter 10: Light Reflection and Refraction

Question 1. Which of the following can make a parallel beam of light when light from a point source is incident on it?
(a) Concave mirror as well as convex lens
(b) Convex mirror as well as concave lens
(c) Two plane mirrors placed at 90° to each other
(d) Concave mirror as well as concave lens

Question 2. A 10 mm long awl pin is placed vertically in front of a concave mirror. A 5 mm long image of the awl pin is formed at 30 cm in front of the mirror. The focal length of this mirror is
(a) -30 cm
(b) -20 cm
(c) -40cm
(d) -60 cm

Question 3. Under which of the following conditions a concave mirror can form an image larger than the actual object?
(a) When the object is kept at a distance equal to its radius of curvature
(b) When object is kept at a distance less than its focal length
(c) When object is placed between the focus and centre of curvature
(d) When object is kept at a distance greater than its radius of curvature

Answer: (c) When object is placed between the focus and centre of curvature

Question 8.
Which of the following statements is true?
(a) A convex lens has 4 dioptre power having a focal length 0.25 m
(b) A convex lens has -4 dioptre power having a focal length 0.25 m
(c) A concave lens has 4 dioptre power having a focal length 0.25 m
(d) A concave lens has -4 dioptre power having a focal length 0.25 m.

Answer: (a) A convex lens has 4 dioptre power having a focal length 0.25 m

Question 9.
Magnification produced by a rear view mirror fitted in vehicles
(a) is less than one
(b) is more than one
(c) is equal to one
(d) can be more than or less than one depending upon the position of the object in front of it.

Answer: (a) is less than one

Question 10.
Rays from Sun converge at a point 15 cm in front of a concave mirror. Where should an object be placed so that size of its image is equal to the size of the object?
(a) 15 cm in front of the mirror
(b) 30 cm in front of the mirror
(c) between 15 cm and and 30 cm in front of the mirror
(d) more than 30 cm in front of the mirror

Answer: (b) 30 cm in front of the mirror

Question 11.
A full length image of a distant tall building can definitely be seen by using
(a) a concave mirror
(b) a convex mirror
(c) a plane mirror
(d) both concave as well as plane mirror

Question 12.
In torches, search lights and headlights of vehicles the bulb is placed
(a) between the pole and the focus of the reflector
(b) very near to the focus of the reflector
(c) between the focus and centre of curvature of the reflector
(d) at the centre of curvature of the reflector

Answer: (b) very near to the focus of the reflector

Question 13.
The laws of reflection hold good for
(a) plane mirror only
(b) concave mirror only
(c) convex mirror only
(d) all mirrors irrespective of their shape

Answer: (d) all mirrors irrespective of their shape

Question 15.
You are given water, mustard oil, glycerine and kerosene. In which of these media a ray of light incident obliquely at same angle would bend the most?
(a) Kerosene
(b) Water
(c) Mustard oil
(d) Glycerine

Question 18.
A child is standing in front of a magic mirror. She finds the image of her head bigger, the middle portion of her body of the same size and that of the legs smaller. The following is the order of combinations for the magic mirror from the top.
(a) Plane, convex and concave
(b) Convex, concave and plane
(c) Concave, plane and convex
(d) Convex, plane and concave

Answer: (c) Concave, plane and convex

Question 20.
Light travel fastest in
(a) Water
(b) Air
(c) Glass
(d) Diamond

Question 23.
The mirror having reflection surface curved outward
(a) plane mirror
(b) concave mirror
(c) convex mirror
(d) cylindrical mirror

Question 24.
The mirror having reflecting surface curved inwards
(a) plane mirror
(b) convex mirror
(c) cylindrical mirror
(d) concave mirror

Question 25.
The mirror used as rear-view mirror in vehicles
(a) convex mirror
(b) plane mirror
(c) cylindrical mirror
(d) concave mirror

Question 26.
The deviation of light ray from its path when it travels from one transparent medium to another transparent medium is called
(a) reflection
(b) refraction
(c) dispersion
(d) scattering

Question 27.
Convex lens is also known as
(a) converging lens
(b) diverging lens
(d) axial lens

Question 28.
The image which is formed behind the mirror
(a) real image
(b) virtual image
(c) blue image
(d) partial image