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

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

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

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

A thin concave and a thin convex lens are incontact.

The ra

The ra

A + 1.9 lens has a focal length of 25 mm. The diameter of le

The focal length and power of the combination of convex and

If fo is focal length of objective and fe is focal length of

If Sample class has a Length property with get and set acces

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