Question

For an equiconcave lens the formula 1/f
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Answer 1

Answer:

Hey dude it's equiconvex not equiconcave

Using lensmaker's formula, we know that, for a glass made of glass (μ=1.5), the focal length of an equiconvex lens is equal to its radius of curvature. ∴1F=260+130=115 or F=+15cm.

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Answer 2

Answer:

Derive Lens marker for formula 1/f = ( n- 1) ( 1/R1 - 1/R2).The lower, of the concave mirror's reflecting surface with an opaque material.