Light - Study Mode
[#236] The terminal colour bands of the rainbow are
Correct Answer
(D) Violet and Red
[#237] Assertion (A): A stick is dipped in water in a slanting position. If observed sideways, the stick appears short and bent at the surface of the water. Reason (R): A light coming from the stick undergoes scattering from water molecules giving the stick a short and bent appearance.
Correct Answer
(C) (A) is true, but (R) is false
[#238] A defect of vision in which the points in one plane of an object appear infocus while those in another plane are out of focus is called
Correct Answer
(B) astigmatism
[#239] The focal length of a convex lens is 25 cm. Calculate its power.
Correct Answer
(D) 4 D
[#240] . . . . . . . . is used in yellow lamp street lights?
Correct Answer
(D) sodium