Question

you are given lenses with power +10 D, +5D, -5D,-20D and -10D. Taking a pair of lenses at a time, which two lenses will you select to have a combination of total focal length when two lenses are kept in contact in each case​​

Answer 1

Answer:

sorry bro I haven't get your question

may It will help you

Explanation:

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

Answer 2

Answer:

Mark as brainliest

Here is your answer , refer to the attachment