A lens is made of glass having an index of refraction of 1.5. Oneside of the len

Question

A lens is made of glass having an index of refraction of 1.5. Oneside of the lens is flat, and the other convex with a radius ofcurvature of 18 cm. (a) Find the focal length of the lens.
1 cm

(b) If an object is placed 36 cm infront of the lens, what is the image distance i? (Includethe sign, or type 'infinity', as necessary.)
2 cm
(a) Find the focal length of the lens.
1 cm

(b) If an object is placed 36 cm infront of the lens, what is the image distance i? (Includethe sign, or type 'infinity', as necessary.)
2 cm

Explanation / Answer

We have the lens makers formula (1/f) =(n-1)(1/R1-1/R2) here R2=0 Then focal length f = R1/(n-1)                             =(18cm)/(1.5-1)                             = 36cm As the object is placed exactly at the focal point, thereforethe image will be formed at infinity.

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