Question

three lenses having power 2 , 2.5 and 1.7 d are kept touching in a row what is the total power of the lens combination ? ​

Answer 1

HERE IS YOUR ANSWER :-

Electric boards are generally made by using wood. The reason is that the wood is a bad conductor of electricity and it cannot conduct electricity.

It is impossible for the electricity to pass through the wood. So that person who are accessing have no possibilities of getting affected by the electricity when any current leakage had occurred.

The wood will resist the electricity leakage and the current flow will happen only within the board and not outside it.

Given-. P1=2D,P2=2.5D ,P3=1.7D

To find- P

Solution- total power of the lens

combination,

P=P1+P2+P3

=2+2.5+1.7

=6.2D

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Answer 2

Answer:

the power of the lens is 6.2D