Question

Answer the following question:

5. An object 4 cm in size is placed at a distance of 25 cm from a concave mirror of focal length
15 cm. Find the position, nature and height of the image.

6. Focal length of a convex mirror is 50 cm. What is its radius of curvature?

7. What is mirror formula?

8. Light travels through water with a speed of 2.25 x 108 m/s. What is the refractive index of
water? Given speed of light in vacuum = 3 x 108 m/s.

9. A concave lens of focal length 25 cm and convex lens of focal length 20 cm are placed in
contact with each other. What is the power of this combination? Also calculate focal length
of the combination.

10. The magnification produced by a plane mirror is m = +1. What does this mean?

11. What is Ohm's law?

12. What is the S.I. Unit of resistance?
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Answer 1

Answer:

this is so big ask one by one