Question

The property by which light travels in the straight line is termed
as_______________________
2. Light travels with a speed of ______________________________km/s in air.
3. The splitting of white light into its seven constituent colours is
called________________
4. A ____________________ lens always forms an erect, virtual and diminished
image.
5. The inner surface of a spoon acts like a ____________ while its outer surface
acts like a _________________
6. An image formed on a screen is called a ______________
7. ____________mirrors are used as side mirrors in scooters /cars.
8. The lenses which feel thicker in the middle than at the edges are
______________
9. The seven colours in rainbow are red, orange, yellow, green, blue, __________
and _____________
10. The perpendicular drawn to the mirror’s surface at the point of incidence is
called ________________
II. Match the items in column I with the items in column II:
Column I Column II
1. A plane mirror a. Used as a magnifying glass
2. A concave mirror b. Can form image of objects spread over a large area
3. A convex lens c. Used by dentists to see enlarged image of the teeth
4. A concave mirror d. The image is erect and of the same size of an object
5. A concave lens e. The image is erect and smaller in size than the object

Answer 1

Answer:

1. rectilinear propagation
2. 3 *10 -8 m/s
3. dispersion
4. concave lens

real image (6)

convex

violet and indigo

normal