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The combination of convex lens and concave lens each of foca

Two concave lenses of 60 cm focal length are cemented on eit

A thin concave and a thin convex lens are incontact.

The ra

The ra

The focal length and power of the combination of convex and

A concave mirror and a convex lens both have same focal leng

A convex lens has a focal length of 30 cm. Calculate at what

In a telescope the object glass of focal length 14 cm, is lo

A convex lens of focal length 8 cm is to be used to form a v

If a concave lense have focal of 10 cm. At what distance sho

A object of lenght 4cm is placed at a distance 20cm from a c