Forum

Light – Reflection and Refraction

The path of a ray of light coming from air passing through a rectangular glass slab traced by four students are shown as A,
B, C and D in Figure. Which one of them is correct?

(a) A
(b) B
(c) C
(d) D

Light – Reflection and Refraction

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

Light – Reflection and Refraction

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

Light – Reflection and Refraction

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

Light – Reflection and Refraction

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 30 cm in front of the mirror
(d) more than 30 cm in front of the mirror

Light – Reflection and Refraction

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

Light – Reflection and Refraction

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

Light – Reflection and Refraction

A beam of light is incident through the holes on side A and emerges out of the holes on the other face of the box as shown in the Figure . Which of the following could be inside the box?

(a) Concave lens
(b) Rectangular glass slab
(c) Prism
(d) Convex lens

Light – Reflection and Refraction

Beams of light are incident through the holes A and B and emerge out of box through the holes C and D respectively as shown in the Figure. Which of the following could be inside the box?

(a) A rectangular glass slab
(b) A convex lens
(c) A concave lens
(d) A prism

Light – Reflection and Refraction

A light ray enters from medium A to medium B as shown in Figure. The refractive index of medium B relative to A will be

(a) greater than unity
(b) less than unity
(c) equal to unity
(d) zero