WONDERS OF LIGHT PART - I

FILL IN THE BLANKS

Fill in the blanks for convex lens.

MATCH THE FOLLOWING

DEFINE 

Distance of distinct vision.

Power of accommodation.

Adaptation.

Focal length of lens.

Principal focus of convex lens (F)

Principal axis of lens.

Optical centre of lens.

Centre of curvature of lens.

Focal length of mirror

Focus length of concave mirror.

Principal axis of mirror.

Centre of curvature of mirror (C).

ANSWER THE FOLLOWING 

State the different positions of sources of light with respect to the concave mirror.

What is ray diagram? What are the rules used for drawing ray diagram for the formation of image by spherical mirror.

What is meant by power of accommodation of eye?

State the function of iris and Ciliary muscles in human eye.

If you are given a part of hollow spherical glass,how will you convert it into hollow spherical mirror.

DISTINGUISH BETWEEN

Myopia and Hypermetropia

Convex mirror and concave mirror.

GIVE REASON

You cannot enjoy watching a movie from a very short distance from the screen in a cinema hall.

A simple microscope is used by watch repairers.

A concave lens is used to correct myopia.

In old age bifocal lens is necessary for some persons.

Concave mirrors are used in solar devices.

Old people use bifocal glasses.

Convex lens is used to correct hypermetropia.

A concave lens is used to correct myopia.

Convex lens is also called a converging lens.

Concave lens is also called a diverging lens.

A dentist uses a concave mirror while examining teeth.

Concave mirrors are used in torches and in car headlights.

RAY DIAGRAMS

Object at infinity for a concave mirror  [video]

Object between infinity and centre of curvature for concave mirror. [video]

Object at C. [Video]

Object between F and C [video]

Object at focus for a concave mirror. [video]

Object between pole and focus for a concave mirror. [video]

Object at infinity for a convex lens.

Object beyond 2F1 for a convex lens.

Object at 2F1 for a convex lens.

Object between 2F1 and F1 for a convex lens

Object at F1 for a convex lens

Object position between F1 and O for a convex lens.

Divergence of rays by convex mirror.

Draw a neat labelled diagram of a normal human eye. Describe its parts briefly.

Explain the sign conventions for reflection by spherical mirror.

Given below is a diagram showing a defect of human eye. Study it and answer the following questions. 

ANSWER THE FOLLOWING

Applications of spherical mirrors and lenses

Explain myopia with its correction.

Explain Hypermetropia with its correction.

What are the rules for obtaining images by convex lens ?

Explain power of lens with suitable formula.

Explain magnification by a lens with formula.

Explain presbyopia. How does it occurs ?