7. A parabolic mirror, instead of a spherical mirror, can be used to reduce the

Question

7. A parabolic mirror, instead of a spherical mirror, can be used to reduce the occurrence of which effect?

A) spherical aberration

B) light scattering

C) mirages

D) chromatic aberration

8. An object is placed 14.0 cm from a diverging lens. If a virtual image appears 10.0 cm from the lens on the same side as the object, what is the focal length of the lens?

A) –50.0 cm

B) –10.0 cm

C) –8.0 cm

D) –35 cm

9. When red light and green light shine on the same place on a piece of white paper, the spot appears to be

A) white.

B) black.

C) brown.

D) yellow.

11. In a double-slit interference pattern the path length from one slit to the first dark fringe of a double-slit interference pattern is longer than the path length from the other slit to the fringe by

A) one-quarter of a wavelength.

B) one-half of a wavelength.

C) one full wavelength.

D) three-quarters of a wavelength.

Explanation / Answer

7.

A parabolic mirror, instead of a spherical mirror, can be used to reduce the occurrence of spherical aberration

A) spherical aberration

8.

given

u = 14 cm , v = -10 cm and f = ?

1/f = 1/u + 1/v

1/f = 1/14 - 1/10

1/f = - 1 / 35

then f = - 35 cm

9 .

When red light and green light shine on the same place on a piece of white paper, the spot appears to be

: D) yellow.

11 .

In a double-slit interference pattern the path length from one slit to the first dark fringe of a double-slit interference pattern is longer than the path length from the other slit to the fringe by

B) one-half of a wavelength

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