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Common Rays in Thin Lenses

88.In an expe...

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88.In an experiment to measure the focal length of an equiconvex lens following measurements were made |u|=0.30cm and |v| =0.60cm. The image form is real .The focal length of the lens within error limits is

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Q. An optical bench has 1.5

m

long scale having four equal divisions in each cm. While measuring the focal length of a convex lens, the lens is kept at 75

c m

mark of the scale and the object pin is kept at 45

c m

mark. The image of the object pin on the other side of the lens overlaps with image pin that is kept at 135

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mark. In this experiment, the percentage error in the measurement of the focal length of the lens is

Q. An optical bench has 1.5

m

long scale having four equal divisions in each cm. While measuring the focal length of a convex lens, the lens is kept at 75

c m

mark of the scale and the object pin is kept at 45

c m

mark. The image of the object pin on the other side of the lens overlaps with image pin that is kept at 135

c m

mark. In this experiment, the percentage error in the measurement of the focal length of the lens is

Q. An equiconvex lens of focal length

15 c m

is cut into two halves. The focal length of each half is

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.

A lens forms a real image 3 cm high of an object 1 cm high. If the separation of object and image is 15 cm, find the focal length of the lens.

An object is placed 36 cm from a convex lens. A real image is formed 24 cm from the lens. Calculate the focal length of the lens. [2 MARKS]

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Common Rays in Thin Lenses

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