Light - Study Mode
[#266] When beams of red, blue and green lights fall on the same spot, the colour of the light becomes
Correct Answer
(D) White
[#267] The concept of expanding universe is based on
Correct Answer
(A) Doppler effect
[#268] When a convex lens produces a real image of an object, the minimum distance between the object and image is equal to
Correct Answer
(C) twice the focal length of the convex lens
[#269] . . . . . . . . lenses are used by people suffering from hypermetropia.
Correct Answer
(C) convex
[#270] Which one of the following statement about the refractive index of a material medium with respect to air is correct?
Correct Answer
(D) It is always greater than one