Light

Focal length of a plane mirror is

• Zero

• Infinite

• 0.25cm

• 25cm

Mirror formula is defined as ........

• A

• B

• C

• D

Which mirror is shown in the figure?

• convex mirror

• concave mirror

• plane mirror

• silver mirror

What is a stream of light called?

• A) Ray

• B) Beam

• C) Twilight

• D) Sunlight

A reflecting surface is curved outwards. Which of the following mirrors is it likely to be?

• A) Concave

• B) Plane

• C) Convex

• D) All of the above

An object placed 3 m from a plane mirror is shifted by 0.4 m away from the mirror. What is the new distance between the object and its image?

• A) 6.4 m

• B) 6.8 m

• C) 6 m

• D) 5.2 m

Which of the following is a reflector of light?

• A) The sun

• B) The moon

• C) The star

• D ) Fire

The light beam emanating from a torch appears to be starting from a point and travels in various directions.

Identify the nature of light emitted from a torchlight.

• A) Convergent

• B) Divergent

• C) Parallel

• D) Irregular

Why can't we see anything in a dark room?

• A) Everything is black in colour.

• B) Our eyes do not work in darkness.

• C) No light reaches our eyes.

• D) All the light gets scattered.

Why is red light is at the top whileviolet at the bottom of the spectrum?

• Violet light has the medium speed so it is refracted the least.

• Violet light has the highest speed so it is refracted the least

• Red light has the slowest speed so it is refracted the least

• Red light has the highest speed so it is refracted the least.