A convex and concave lens having focal l...

A convex and concave lens having focal lengths of 30 cm and j10 cm respectively are placed at a distance 20 cm from each other.Whre should a source of light be placed so that the system of the two lenses will produce a beam of parallel rays?

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MODERN PUBLICATION-REFRACTION OF LIGHT-EXERCISE

A convex and concave lens having focal lengths of 30 cm and j10 cm res...
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Explain total internal reflection. What are its conditions?
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Obtain a relation between a critical angle and refractive index of med...
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State the condition of total internal reflectoin to take place at an i...
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Define critical angle for total internal reflection.
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