Question

Optics Problem Test No 1
1.Calculate the power of a concave lens of focal length 2 metre.
2, Determine the speed of light in the glass slab of refractive index 1.5 when light travels from air to glass.
3.Find the image distance and nature of the image if an object is placed at a distance 20 cm from the optic centre of the convex lens of focal length 10 cm.

pls write without direct answer pls with his you got this ​

Answer 1

Explanation:

(2).n21=n1/n2

=>1.5=3(10)-⁸m/s/n2.

=>n2=3(10)-⁸/1.5

=>2(10)-⁸.

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Answer 2

Explanation:

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