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Recent questions tagged optical-instruments

The maximum distance a person having defect of short right can see clearly is 4 meters. The power of lens required to correct is

asked Jan 23, 2014 by meena.p

1 answer

The objective of a telescope has a diameter 5 cm. What is the angular seperation in radius of two starts which can be resolved by the telescope when light of $3000 A^{\circ}$ is used.

asked Jan 23, 2014 by meena.p

1 answer

The magnifying power of telescope is 9. when it is adjusted for parallel rays, the distance between objective and eye piece is found to be 20 cm. The focal length of lenses are

asked Jan 23, 2014 by meena.p

1 answer

Magnification produced by astronomical telescope for normal adjustment is 20 and length of telescope is $1.05\;m$ The magnification when image is formed at least distance of district vision $(D= 25 cm)$ is

asked Jan 22, 2014 by meena.p

1 answer

A microscope has objective of focal $1.5\; cm$ and eye piece of focal length $2.5 \;cm$. If length of tube $25\;cm$ What must be the magnification produced.

asked Jan 22, 2014 by meena.p

1 answer

Focal length of eye piece of a compound microscope is

asked Jan 21, 2014 by meena.p

1 answer

What is maximum magnification that can be obtained from a convex lens of focal length 5 cm. (the least distance vision is 25 cm)

asked Jan 21, 2014 by meena.p

1 answer

What should be the focal length of a simple magnifying lens so that it magnifies 10 times and the image is formed 25 cm from the eye.

asked Jan 17, 2014 by meena.p

1 answer

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