Light- Reflection

An object is placed 20 cm in front of a plane mirror. The mirror is moved 2 cm towards the object. The distance between the positions of the original and final images seen in the mirror is:

• 2 cm

• 4 cm

• 10 cm

• 22 cm

No matter how far you stand, your image appears erect. The mirror is likely to be:

• convex

• concave

• both a and b

• none of the above

The angle between an incident ray and the plane mirror is 30⁰ . The total angle between the incident ray and reflected ray will be:

• 30⁰

• 60⁰

• 90⁰

• 120⁰

A ray of light is incident on a plane mirror making an angle of 90⁰ with the mirror surface. The angle of reflection for this ray of light will be:

• 45⁰

• 90⁰

• 0⁰

• 60⁰

Two big mirrors A and B are fitted side by side on a wall. A man is standing at such a distance from the wall that he can see the erect image of his face in both the mirrors. When the man starts walking towards the mirrors, he finds that the size of his face in mirror. A goes on increasing but that in mirror B remains the same.

• mirror A is concave and mirror B is convex

• mirror A is plane and mirror B is concave

• mirror A is concave and mirror B is plane

• mirror A is convex and mirror B is concave

The focal length of a spherical mirror of radius of curvature 30 cm is:

• 10 cm

• 15 cm

• 20 cm

• 30 cm

The real image formed by a concave mirror is larger than the object when the object is:

• at a distance equal to radius of curvature

• at a distance less than the focal length

• between focus and centre of curvature

• at a distance greater than radius of curvature

Magnification produced by a convex mirror is always:

• more than 1

• less than 1

• equal to 1

• more or less than 1

In the concave reflector of a torch, the bulb is placed:

• between the pole and focus of reflector

• at the focus of reflector

• between focus and centre of curvature of reflector

• at the centre of curvature of reflector at the centre of curvature of reflector

Linear magnification produced by a concave mirror may be:

• less than 1 or equal to 1

• more than 1 or equal to 1

• less than 1, more than 1 or equal to 1

• less than 1 or more than 1