Advertisements
Advertisements
Question
A light ray enters from medium A to medium B as shown in Figure 10.2. The refractive index of medium B relative to A will be
Options
greater than unity
less than unity
equal to unity
zero
Advertisements
Solution
greater than unity
Explanation -
The ray of light travelling from medium A to medium B bends towards the normal. It shows that the medium B is denser and the medium A is rarer.
APPEARS IN
RELATED QUESTIONS
Select the correct alternative
The image formed by a plane mirror is
Draw a figure describing the following.
The reflecting surface of two mirrors make an angle of 90∘ with each other. If a ray incident of one mirror has an angle of incidents of 30∘, draw the ray reflected from the second mirror. What will be its angle of reflection?
Differentiate between the reflection of light from a plane mirror and that from a plane sheet of paper.
A light ray is incident normally on a plane mirror. (a) What is its angle of incidence?
What do you understand by the Light?
Why are infinite images not seen when two plane mirrors are facing each other?
An object 3 cm high produces a real image 4.5 cm high when placed at a distance of 20 cm from a concave mirror. Calculate:
- the position of image
- focal length of the concave mirror.
An object 1.5 cm high when placed in front of a concave. the mirror produces a virtual image 3 cm high. If the object is placed at a distance of 6 cm from the pole of the mirror, calculate:
- the position of the image
- the focal length of the mirror.
Copy the figure. By taking two rays from point A, show the formation of image. State four characteristics of the image.
Why do automobile drivers prefer convex mirror as a rear vew mirror? Illustrate your answer.
In the figure is shown a concave mirror. A is a point on the principal axis. If an object O is kept at A, image is formed on A itself. Copy the diagram. Draw the image in the diagram. Is the image real or virtual?
Measure the distance PA and write it in the diagram. What is the distance PA called?
Mark a point B on the principal axis, at which, if a point source of light is kept, the rays travel parallel to principal axis after reflection from M. What is point B called?
Out of the following, choose the substance which is translucent medium:
Locate the image termed when the object is placed between two planes as shown in the following figure.
Which of the following is the best reflector of light?
Differentiate between a reflection and a shadow
Which material is transparent?
Which of the following can make a parallel beam of light when light from a point source is incident on it?
Plane mirrors are used as looking glass, to reflect light on objects and in periscopes.
We can see objects because of ______.
