A meniscus lens is needed for glasses to correct for your nearsightedness. A) Sh

Question

A meniscus lens is needed for glasses to correct for your nearsightedness.

A) Should the image be converging or diverging?

I know it should be diverging but Im having a hard time explaining why..

B)  If the outer surface of the lens (outside surface of the glasses) has radius of curvature 5cm and we want the parallel rays (from infinity) to form an image about 38 cm from the lens, what should be the radius of curvature of th einner surface of the lense (inside surface of glasses)?

the equation that I think should be used is 1/f=(n-1)[(1/R_1)-(1/R_2)]

am I on the right track? and if so what am I plugging in for what, im having a hard time conceptualizing this problem..

Explanation / Answer

A) diverging

B) R1= 5 cm .....          R2 = cm

f = 38cm

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