EASY
Earn 100

what is reflecting telescope ?

Important Questions on Observing Space : Telescopes

EASY
Science>Physics>Observing Space : Telescopes>Telescope
By considering the first correlation complete the second correlation: 
Hubble telescope: 569 km high from earth surface:: Revolving orbit of Hubble telescope: _____. (high earth orbit/ low earth orbit)
EASY
Science>Physics>Observing Space : Telescopes>Telescope
Why does a ray of light bends when it travels from one medium to another?
EASY
Science>Physics>Observing Space : Telescopes>Telescope
Define refraction. State the two laws of refraction.
MEDIUM
Science>Physics>Observing Space : Telescopes>Telescope
Draw a ray diagram showing the path of rays of light when it enters with oblique incidence (i) from air into water; (ii) from water into air.
HARD
Science>Physics>Observing Space : Telescopes>Telescope
We know that light refracts (or bends) when it goes from one medium to another. Now, the atmosphere contains only air. Then how does light get refracted on passing through only air in the atmosphere?
EASY
Science>Physics>Observing Space : Telescopes>Telescope
You are given water, mustard oil, glycerine and kerosene. In which of these media, a ray of light incident obliquely at the same angle would bend the most?
EASY
Science>Physics>Observing Space : Telescopes>Telescope
Give two examples of refraction of light.
MEDIUM
Science>Physics>Observing Space : Telescopes>Telescope
Explain with the help of a diagram why a pencil partly immersed in water appears to be bent at the water surface.
MEDIUM
Science>Physics>Observing Space : Telescopes>Telescope

A concave lens made of a material of refractive index n1 is kept in medium of refractive index n2. A parallel beam light is incident on the lens. Complete the path of rays of light emerging from the concave lens if
  (i) n1>n2(ii) n1=n2(iii) n1<n2

EASY
Science>Physics>Observing Space : Telescopes>Telescope
A ray of light travelling in air enters obliquely into water. Does the light ray bend towards the normal or away from the normal? Why?
EASY
Science>Physics>Observing Space : Telescopes>Telescope
As light from a far off star comes down towards the earth:
MEDIUM
Science>Physics>Observing Space : Telescopes>Telescope
Explain why, if we look at objects through the hot air over a fire, the objects appear to be moving (or shaking) slightly.
EASY
Science>Physics>Observing Space : Telescopes>Telescope
When light rays pass through a lens, they bend and change their direction. This is called _____ of light.
EASY
Science>Physics>Observing Space : Telescopes>Telescope
A pen, when dipped in water in a glass tumbler, appears to be bent at the interface of air and water. Will the Pen appear to be bent to the same extent, if instead of water we use liquid like kerosene or turpentine? Support your answer with reason.
EASY
Science>Physics>Observing Space : Telescopes>Telescope
What happens when a ray of light strikes the surface of separation between the two media at right angle?
MEDIUM
Science>Physics>Observing Space : Telescopes>Telescope
Make two diagrams to explain refraction and dispersion.
EASY
Science>Physics>Observing Space : Telescopes>Telescope

A light ray enters from medium A to medium B as shown in the figure. The refractive index of medium A relative to B will be

Question Image

MEDIUM
Science>Physics>Observing Space : Telescopes>Telescope
With the help of a ray diagram show that a blue ink dot marked on a sheet of paper appears to be raised. Which phenomenon of light is responsible for this effect?
EASY
Science>Physics>Observing Space : Telescopes>Telescope
A point source S is placed in water. Name the type of beam of light it emits. This beam of light after coming out from water converges or diverges. Give reason for your answer.
MEDIUM
Science>Physics>Observing Space : Telescopes>Telescope
Discuss the case in which a convex lens behaves as a diverging lens.