An illuminated object and screen are placed 90cm apart. Determine the focal length and nature of the lens required to produce a clear image on the screen, twice the size of the object.

Question

Saurabh Kumar · Answer

It is given in the question, u = -90 cm
magnification, m = – 2 (take it negative as produced twice the size of the object size)
so we can find the image distance using lens formula
1/f = 1/v - 1/u
Use proper sign convention.
If focal length comes out to be positive, then it would be a convex lens otherwise concave lens.

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An illuminated object and screen are placed 90cm apart. Determine the focal length and nature of the lens required to produce a clear image on the screen, twice the size of the object.

An illuminated object and screen are placed 90cm apart. Determine the focal length and nature of the lens required to produce a clear image on the screen, twice the size of the object.

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An illuminated object and screen are placed 90cm apart. Determine the focal length and nature of the lens required to produce a clear image on the screen, twice the size of the object.

An illuminated object and screen are placed 90cm apart. Determine the focal length and nature of the lens required to produce a clear image on the screen, twice the size of the object.

1 Answers

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