Wonders of light part

1. OMTEX CLASSES SCIENCE AND TECHNOLOGY
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.

2. OMTEX CLASSES SCIENCE AND TECHNOLOGY
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.

3. OMTEX CLASSES SCIENCE AND TECHNOLOGY
Concave mirrors are used in torches and in car headlights.
RAY DIAGRAMS
Object at infinity for a concave mirror
Object between infinity and centre of curvature for concave mirror.
Object at centre of curvature for concave mirror.
Object between F and C for a concave mirror
Object at focus for a concave mirror.
Object between pole and focus for a concave mirror.
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.

4. OMTEX CLASSES SCIENCE AND TECHNOLOGY
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 ?