one of the factors of (p+q)^2 - (a-b)^2 + p + q - a + b is
Answers
Step-by-step explanation:
Classwork
Short answers questions:-
1)
Answer: The refracted angle will be less.
2)
Answer: Refraction of light at the surface of the water makes swimming pools appear
shallower than its actual depth when viewed from directly above . When light emerges from glass or water into the air it speeds up again. If it meets the glass - air boundary at any angle other than Oo it will refract away from the normal.
3)
Answer: Because the Refractive index of water is 1.42 or 1.48 due to which we can see the position of the coin is changed rather than in glass lab.
4)
Answer: There are seven colours are formed in a rainbow.
The colours of rainbow are :
Red
Orange
Yellow
Green
Blue
Indigo
Violet
5)
Answer : Violet color suffers maximum deviation through a prime.
6)
Answer: The object should be placed at front of concave mirror to produce an inverted magnified and real images is formed at infinity.
7)
Answer:
Used as Security mirror in shops .
Used for making sun glasses and telescopes.
8)
Answer: The centre of the hollow sphere of which the mirror is a part.
9)
Answer: The distance between the focus 'F' and the pole 'P' of curved mirror.
10)
Answer: Radius of curvature = 20 cm
Radius of curvature of the spherical mirror = 2×
Focal length (f) R= 2f
F=R/2=20/2=10
Therefore, the focal length of the spherical mirror is 10 cm.
11)
Answer: Dispersion of white light is defined as splitting of white light into seven constituent colours when passed through the prism. White light dispersion occurs because, as they pass through a prism, different colours of light bend through different angles with respect to the incident ray.
12)
Answer:
Red
Orange
Yellow
Green
Blue
Indigo
Violet
13)
Answer:j