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[#421] A person holding a pen in his left hand sees his reflection in the mirror holding the pen in his right hand. This is due to which of the following phenomena?

(A) Diffused reflection

(B) Total internal reflection

(C) Lateral inversion

(D) Refraction

Correct Answer

(C) Lateral inversion

[#422] If objects appear enlarged and inverted in a rear view mirror, then which type of mirror is used?

(A) Concave

(B) Convex

(C) Cylindrical

(D) Plane

Correct Answer

(A) Concave

[#423] At what medium does light travel maximum speed?

(A) vacuum

(B) Glasss

(C) water

(D) air

Correct Answer

(A) vacuum

[#424] Find the distance of an object from a concave mirror whose focal length is 10 cm so that the distance of image from mirror is four times the distance of the object will be-

(A) 7.5 cm.

(B) 5 cm.

(C) 2.5 cm.

(D) 12.5 cm.

Correct Answer

(D) 12.5 cm.

[#425] A soap bubble shows colours when illuminated with white light. This is due to . . . . . . . .

(A) Diffraction

(B) Polarisation

(C) Interference

(D) Reflection

Correct Answer

(C) Interference