Image Formation in Convex Mirrors

Q. An object is placed at a distance of $30\text{cm}$ from a convex mirror. The distance of the image formed is $10\text{cm}$ from the mirror. Calculate the focal length of the mirror.

1. $15\text{cm}$
2. $-15\text{cm}$
3. $7.5\text{cm}$
4. $-7.5\text{cm}$

Q.

Find the focal length of the given mirror.

1. + 20 cm
2. – 30 cm
3. – 20 cm
4. + 30 cm

Q. Question 12
An object is placed at a distance of 10 cm from a convex mirror of focal length 15 cm. Find the position and nature of the image.

Q.

An object is placed in front of a convex mirror at a distance of $60m$ from its pole. Object starts moving towards the mirror at $20m{s}^{-1}$. Find the average speed of the image for a time interval of $2s$ if the focal length of the mirror is $20m$.

1. $0.568m{s}^{-1}$

2. $1m{s}^{-1}$

3. $3m{s}^{-1}$

4. $2.5m{s}^{-1}$

Q.

Find the focal length of the given mirror.

1. + 30 cm
2. – 20 cm
3. – 30 cm
4. + 20 cm

Q. A point object is placed at a distance of 30 cm from a convex mirror of focal length 30cm. The image will form at

1. Infinity
2. 15 cm infront of the mirror
3. 20 cm infront of the mirror
4. 15 cm behind the mirror

Q. An object 20 cm from a convex mirror give rise to a virtual image 15 cm behind the mirror. The focal length of the mirror is

1. 8.5 cm
2. 90 cm
3. 30 cm
4. 60 cm