Light

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.

Which of the following are used in projectors?

• A) Concave lens

• B) Convex mirrors

• C) Plane mirrors

• D) Convex lenses

What happens during lateral inversion?

• A) The right of the object will be on the right side of the image.

• B) The left side of the object will be on the left side of the image.

• C) The upper part of the object will be at the bottom of the object.

• D) The right side of the object will be on the left side of the image.

Which one of the following statements is true?

• A) A plane mirror sometimes forms an inverted image.

• B) A concave mirror always forms a virtual, erect and diminished image.

• C) A concave lens always forms a virtual, erect and diminished image.

• D) All of the above

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

Why are convex mirrors used by drivers as rear view mirrors in vehicles?

• A) They reflect light better than other mirrors.

• B) They produce images which are clearer than those produced by others

• C) They produce magnified images.

• D) They give a wide field of view.

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

An object was placed in front of the plane mirror as shown in the given picture. How will its image formed in plane mirror look like ?

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Why is a spectrum of seven colours formed when sunlight passes through a prism?

• A) White light is a mixture of seven colours.

• B) The different colours of light is reflected at different angles in a glass prism.

• C) The prism adds colour to the white sunlight.

• D) Light travels at high speed.

Which of the following letters will be seen without any change in a plane mirror?

• A) S

• B) T

• C) L

• D) P