4. Which of the following best describes the image of a concave mirror when the

Question

4. Which of the following best describes the image of a concave mirror when the object distance is equal to the radius of curvature? a. virtual, upright and magnification one b. real, inverted and magnification less than one c. virtual, upright and magnification less than one d. real, inverted and magnification one 5. An object is placed 30.0 cm from a thin converging lens with a focal length of 10 cm. Which one of the following statements is true concerning the image? (a) The image is virtual and 6.0 cm from the lens. (b) The image is virtual and 12 cm from the lens. (c) The image is real and 30.0 cm from the lens. (d) The image is real and 15.0 cm from the lens. (e) The image is real and 12 cm from the lens

Explanation / Answer

4)

(d) Real, inverted and magnification one.

When the object is placed at R, image is formed at the same place and is inverted.

5)

(d) The image is real and 15cm from the lens.

Use thin lens eqn:

1/f = 1/u + 1/v

=> 1/v = 1/f - 1/u

=> 1/v = (1/10) - (1/30)

=> v = 15cm

Positive v means the image is real.

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