What is th magnification produced by a single convex lens used as simple microscope in normal use?

What is magnification of a lens?

A person using a lens as a simple microscope sees a

Write expression for the magnification produced by a lens system.

What is linear magnification? Write its expression for a convex lens.

The magnification produced by plane mirror is +1. What does this mean?

The question given below consist of an assertion (A) and a reason ( R). Use the following key to choose the appropriate answer to these questions from the codes (a), (b), ( c) and (d) given below: (a) Both A and R are true and R is the correct explanation of A. (b) Both A and R are true but R is NOT the correct explanation of A. (c) A is true but R is false. (d) A is false and R is also false. Assertion: A convex lens of focal length 30 cm and can't be used as a simple microscope in normal setting. Reason: For normal setting, angular magnification of simple microscope is M=D//F .

Two lenses convex lens of focal length 30 cm in contact with a concave lens of focal length 20 cm, if they are placed 8.0 cm apart with their principal axes coincident. An object 1.5 cm in size is placed on the side of the convex lens. The distance between the object and the convex lens is 40 cm. Determine the magnification produced by the two-lens system, and the size of the image.