Image of an object approching a convex mirror of radius of curvature 20 m along its optical axis so is observed to move from $\frac{25}{3}$ m to $\frac{50}{7}$ m into 30s. what is the speed of the object in $K m / h$ ?

3

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

4

No worries! We‘ve got your back. Try BYJU‘S free classes today!

5

No worries! We‘ve got your back. Try BYJU‘S free classes today!

6

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Open in App

Solution

The correct option is A $3$
$A = 20 m$ $f = 10 m .$
From the mirror equation $:$
$\frac{1}{v_{1}} + \frac{1}{u_{1}} = \frac{1}{f};$
$\frac{1}{25 / 3} + \frac{1}{u_{1}} = \frac{1}{10};$
$= u_{1} = - 50 m .$
furthermore $,$ when the picture of the question is at $50 / 7 m .$
$\frac{1}{V_{2}} + \frac{1}{u_{2}} = \frac{1}{f}$
$\frac{1}{50 / 7} + \frac{1}{u_{2}} = \frac{1}{10}$
$= u_{2} = 25 m$
contrast out there of the protest $= 50 - 25 = 25 m$
speed $=$ relocation/time
$= 25 / 30$
$5 / 6 m / s e c$
speed in $k m / h$ $= 5 / 6 \times 18 / 5$
$= 3 k m / h .$
Hence,
option $(A)$ is correct answer.

Suggest Corrections

Similar questions

Q. Image of an object approaching a convex mirror of radius of curvature

20 m

along its optical axis is

2550

observed to move from

25 / 3 m

50 / 7 m

30

seconds. What is the speed of the object in km per hour?

An object is placed in front of a convex mirror at 60 m from the mirror. Its radius of curvature is 40 m. The object starts moving towards the mirror at 20 m/s. Then the average speed of the image after a time interval of 2 sec is ___ m/s.

Q. An object is placed at 30 m in front of a concave mirror. If its radius of curvature is 20 m, then what will be its image distance?

Q. An object is placed in front of a convex mirror at

60 m

from the mirror. Its radius of curvature is

40 m

. The object starts moving towards the mirror at

20 m s^{- 1}

. Find the average speed of the image after a time interval of 2 seconds?

An object is placed at 60 m in front of a concave mirror. If its radius of curvature is 20 m, then the image distance is equal to ___ m.

Join BYJU'S Learning Program

Image of an object approching a convex mirror of radius of curvature 20 m along its optical axis so is observed to move from 253 m to 507m into 30s. what is the speed of the object in Km/h?

Image of an object approching a convex mirror of radius of curvature 20 m along its optical axis so is observed to move from $\frac{25}{3}$ m to $\frac{50}{7}$ m into 30s. what is the speed of the object in $K m / h$ ?