e refractive index is: is larger for blue light than red. 41. b. Is larger for r

Question

e refractive index is: is larger for blue light than red. 41. b. Is larger for red light than blue. c. Does not change with wavelength. d. It is the lowest for diamond. The power of a lens that has a focal length of-25 cm is: a. -25 cm b. -0.25 m c. 4.0 D d. -0.25 D 42. A convex lens has a focal length of 20 cm. An object 4 cm high placed at the center of curvature of this lens will be an image: a. smaller than 4 cm. b. larger than 4cm c. 4 cm in length. d. erect and 4cm high. 43. An object placed at the focus of a lens will have: a. an image smaller than the object. b. an image larger than the object. c.) no image 44. d. a larger and inverted image.

Explanation / Answer

a) The refractive index increases with increasing frequency, therefore the index of refraction of blue light is larger than red light.   A  

b) power of a lens in inversely related to the focal length

P = 1/f = -1/( 25 x 10-2) = -4.0 D. C

c) when object is placed at center of curvature, a same sized, real and inverted image is formed .  C

d) when the object is placed at focus of a lens, the image in formed at infinity,means no image. C

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