An achromatic doublet of focal length 25 cm is to be made by placing a convex...

 

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An achromatic doublet of focal length 25 cm is to be made by placing a convex lens of borosilicate crown glass in contact with a diverging lens of dense flint glass. Assuming n₁ = 1.61864, n = 1.62468, n =1-71426 and n =1-72906, calculate the focal length of each lens. Here, the unprimed and the primed quantities refer to the borosilicate crown glass and dense flint glass respectively. 15 An achromatic doublet of focal length 25 cm is to be made by placing a convex lens of borosilicate crown glass in contact with a diverging lens of dense flint glass. Assuming n₁ = 1.61864, n = 1.62468, n =1-71426 and n =1-72906, calculate the focal length of each lens. Here, the unprimed and the primed quantities refer to the borosilicate crown glass and dense flint glass respectively. 15

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In the given problem we are asked to calculate the focal lengths of two lenses in an achromatic doublet one made of borosilicate crown glass and the o... View the full answer