Q.1.
If a man’s face iscm in front of concave shaving mirror producing erect image 1.5 times the size of face, focal length of the mirror would be:
Q.2.
A student is 2.away from a convex lens while her image is 1.from the lens, what is the focal length?
Q.3.
You are given three media A, B and C of refractive index 1.1.and 1.The medium in which the light will travel fastest is
Q.4.
If the power of a lens is – 2 D, what is its focal length?
Q.5.
What does The law of reflection state?
Q.6.
What colour is best to be seen in the dark?
Q.7.
What is reflective in our classroom?
Q.8.
Is a tree reflective?
Q.9.
What does translucent mean?
Q.10.
What does transparent mean?
Q.11.
What does opaque mean?
Q.12.
What happens if the light hits a smooth surface?
Q.13.
Where does light come from?
Q.14.
What do you use to see?
Q.15.
According to the laws of reflection, if i = angle of incidence and r = angle of reflection,
Q.16.
Law of Reflection states that the incident angle is ____ the reflected angle
Q.17.
The two types of spherical mirrors are ...............
Q.18.
In a concave mirror, if an incident ray passes through F and hits the mirror then it will reflect
Q.19.
An image that forms when light rays actually meet
Q.20.
The phenomenon by which the incident light falling on a surface is sent back into the same medium is known as ________.