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[#161] . . . . . . . . is also called a convergence mirror-

(A) convex mirror

(B) concave mirror

(C) plane mirror

(D) Non of these

Correct Answer

(B) concave mirror

[#162] A point on the principle axis of lens through which light rays pass undeviated, is called

(A) First focus

(B) Second focus

(C) Optical centre

(D) None of these

Correct Answer

[#163] Which one of the following statements is not correct?

Correct Answer

(A) Human eye is a refracting system containing a diverging lens
(F) Power of a convex lens is negative and that of a concave lens is positive
(K) The wavelength of gamma rays is longer than that of X-rays

[#164] The power of a lens is measured in

(A) Dioptre

(B) Aeon

(C) Lumen

(D) Candela

Correct Answer

(A) Dioptre

[#165] The focal length of a concave mirror with radius of curvature of 20 cm will be-

(A) 15 cm

(B) 20 cm

(C) 5 cm

(D) 10 cm

Correct Answer

(D) 10 cm