Question

 

7. Assertion (A): The power of a concave lens is positive.

Reason (R) : A Concave lens always forms a virtual image of an object.

​

Answer 1

Answer:

Both A and R are true and R is the correct explanation of A

Answer 2

Explanation:

$</p><p>\small</p><p>\mathbf</p><p>\green</p><p>{{What \: is \: Biosphere ? }}</p><p></p><p>$

• The biosphere is a narrow zone of the earth where land, water, air interact with each other to support life.
• It is in this zone that life exists.
• There are several species of organisms that vary in size from microbes and bacteria to large mammals.