Name a few uses of magnifying glass.

Draw a labelled diagram showing course of rays for a simple microscope or magnifying glass.

A converging lens of focal length 6.25 cm is used as magnifying glass. If the near point of the observer is 25 cm from the eye and the lens is held close to the eye, calculate the distance of the object from the lens

Give few uses of coal.

Answer the following questions: The angle subtended at the eye by an object is equal to the angle subtended at the eye by the virtual image produced by a magnifying glass. In what sense then does a magnifying glass provide angular magnification?

A man with normal near point (25 cm) reads a book with small print using a magnifying glass: a thin convex lens of focal length 5 cm- What is the maximum and the minimum angular magnification (magnifying power) possible using the above simple microscope?

Why do we prefer a magnifying glass of smaller focal length?

What should be the position of an object relative to biconvex lens so that it behaves like a magnifying glass?

Answer the following question: In viewing through a magnifying glass, one usually positions one’s eyes very close to the lens. Does angular magnification change if the eye is moved back?

Name a few forms of cry gene.