Important terms related to a spherical mirror

Q.

Define focus

Q.

what is the focal length of plane mirror

Q.

A ray of light falling parallel to the principal axis on a convex mirror follows ray number ___ as its path.

Q.

If the radius of curvature of the convex mirror is $30cm,$ find the focal length.

Q.

Write uses of plane mirror.

Q.

The focal length of a concave mirror is 0.15 m. What will be its radius of curvature?

Q.

What is the value of the focal length of plane mirror

Q. A convex mirror of focal length $f$ (in air) is immersed in a liquid $(\mu =\frac{4}{3})$. The focal length of the mirror in liquid will be:

1. $\left(\frac{3}{4}\right)f$
2. $\left(\frac{4}{3}\right)f$
3. $f$
4. $\left(\frac{7}{3}\right)f$

Q.

A concave mirror is held in water. What would be the change in the focal length of the mirror? [1 MARK]

Q.

The radius of curvature of a concave mirror is 10cm. The image of the sun will be formed at a distance___ from the pole of the mirror.

Q. Question 13
The laws of reflection hold good for

(a) plane mirror only
(b) concave mirror only
(c) convex mirror only
(d) all mirrors irrespective of their shape

Q. The focal length of a concave mirror depends on:

1. The radius of curvature of the mirror
2. The object distance from the mirror
3. The image distance from the mirror
4. Both the image and the object distance

Q.

A concave mirror is also known as a diverging mirror.

1. True
2. False

Q. The distance from the pole of a spherical mirror to its focus is called _______ of that mirror.

Q. Which mirror is to be used to obtain a parallel beam of light from a point source?

1. Plane mirror
2. convex mirror
3. Concave mirror
4. None of these.

Q.

What was the advantage of having HST design with two hyperbolic mirrors?

Q.

‘x’ in the diagram represents:

1. Focus

2. Centre of curvature

3. Optical Centre

4. Pole

Q. If a spherical mirror is immersed in a liquid, its focal length will:

1. Increase
2. Decrease
3. Remain unchanged
4. Depend on the nature of liquid

Q. If we say that the focal length of a spherical mirror is $n$ times its radius of curvature, then $n$ must be

1. $2.0$
2. $0.2$
3. $1.5$
4. $0.5$

Q. The focal length of a spherical mirror of radius of curvature $40cm$ is

1. $10cm$
2. None
3. $20cm$
4. $80cm$

Q. Focal length ($f$) is the distance of principal focus from ______ of mirror.

1. Centre of curvature
2. Focus principal (F)
3. Pole (P)
4. None

Q. Which among the following points is the focus of the given mirror?

1. W
2. X
3. Y
4. Z

Q.

The point F is the :

1. Principal axis
2. Principal focus
3. Pole
4. None

Q. Fill in the blanks :

Q. Does the focal length of a spherical mirror change when it is completely immersed in the water? Predict and write the reason