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[#61] Two convex lenses with power 2 D are kept in contact with each other. The focal length of the combined lens system is
Correct Answer
(D) 0.25 m
[#62] Image formed by the plane mirror is
Correct Answer
(D) Virtual and laterally inverted
[#63] Twinkling of stars is due to
Correct Answer
(D) large distance of stars and fluctuations in the density of air
[#64] Find the position of the image formed by a concave mirror when the object is placed between P and F?
Correct Answer
(C) Behind the mirror
[#65] The focal length of a convex lens is 50 cm. Calculate its power.
Correct Answer
(B) 2D