In a particular optical material light travels 1 cm in a time of 5 times 10^-11

Question

In a particular optical material light travels 1 cm in a time of 5 times 10^-11 seconds. What is the index of refraction in this medium? A) 0.67 B) 1.00 C) 1.25 D) 1.33 E) 1.50 An object of 5 cm height is at a position 15 cm away from a spherical concave mirror. The radius of curvature for the mirror is 20 cm. How far will the image be from the mirror? A) 15 cm B) 20 cm C) 25 cm D) 30 cm E) 35 cm In the figures below, the focal point is 10 cm from the mirrors. Which statement is false? A) An object placed 15 cm to the left of the mirror in Fig. b produces a virtual image. B) An object placed 5 cm to the left of the mirror in Fig. a produces a virtual image. C) An object placed 15 cm to the left of the mirror in Fig. a produces an enlarged image. D) An object placed 25 cm to the left of the mirror in Fig. a produces a diminished image. E) An object placed 25 cm to the left of the mirror in Fig. b produces an inverted image.

Explanation / Answer

1) (E)1.50 is the correc answer.

explanation:

The index of refraction is related to light in vacuum(c) and lihght in medium(v) as

n = c/v

v = d/t = 0.01m/5 x 10^-11 = 2 x 10^8 m/s

n = 3 x 10^8/ 2 x 10^8 = 1.50

Hence, n = 1.50 (E) is the correc answer.

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