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Common Rays in Thin Lenses

In an experim...

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In an experiment to determine the focal length of a lens, the following readings were taken u=20.1+-0.2 cm, v=50.1+-0.5 cm. The percentage error in focal length is nearly___?

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Q. Calculate focal length of a spherical mirror from the following observations.

Object distance, u=(50.1±0.5)u=(50.1±0.5) cm

Image distance, v=(20.1±0.2) cm

Q. If for a spherical mirror object distance,

u = (50.1 \pm 0.5) c m

and image distance

v = (20.1 \pm 0.2) c m

, then focal length of the spherical mirror will be

Q. In an experiment to measure focal length of a concave mirror, the values of focal length in successive observations are

17.3 c m

17.8 c m

18.3 c m

18.2 c m

17.9 c m

18.0 c m

. Calculate mean absolute error and percentage error. Express the result in a proper way.

Which of the following lenses would you prefer to use while reading small letters found in a dictionary?

(a) A convex lens of focal length 50 cm

(b) A concave lens of focal length 50 cm

(c) A convex lens of focal length 5 cm

(d) A concave lens of focal length 5 cm

Q. Question 6
Which of the following lenses would you prefer to use while reading small letters found in a dictionary?

(a) A convex lens of focal length 50 cm
(b) A concave lens of focal length 50 cm
(c) A convex lens of focal length 5 cm
(d) A concave lens of focal length 5 cm

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Common Rays in Thin Lenses

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