Question

I which type of questions does the lens and the mirror formula is used.??? and what is power I am in 10th I need your help.​

Answer 1

Answer:

In combined question such that combination of lens mirror is used.

Power is reciprocal of focal length in meter, unit of power is Diopter (D)

P = 1/f(in m)

or P = 100/f ( in cm)

Answer 2

hala mate,

the mirror formula and lens formula is used in concave and convex question.

for example.

A convex lens forms a real and inverted image of a needle at a distance of 50 cm from it. Where is the needle placed in front of the convex lens if the image is equal to the size of the object? Also find the power of the lens.

The power of a lens is its ability to bend light – the greater the power the greater the refraction of light.

The power of a lens is also related to the focal length by the following formula:

Power of a lens = 1/focal length of the lens

hope it helps!!