55. No matter how far an object from the spherical lens the image of the object appears erect. The lens is
O a. concave
O b. convex
O c. either concave or convex
0 d. none of these
56 A thick black lauld formed by heating coal in the absence of air:
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Answer:
55. Option D, 56. Option C
Explanation:
55.Plane mirror and convex mirror forms a virtual image irrespective of the position of the object.
56.Coal tar is a thick black liquid formed by heating coal in the absence of air. Coal tar is used to construct road and water proofing.
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