An object at a distance of 30 cm from a ...

An object at a distance of 30 cm from a concave mirror gets its image at the same point. The focal length of the mirror is

-30cm

+30cm

-15cm

+15cm

Text Solution

Verified by Experts

The correct Answer is:

When object is placed at 2F, the image formed by concave mirror is also at 2F. So 2F = -30 or F = -15 cm.

Topper's Solved these Questions

QUARTERLY MODEL QUESTION PAPER
SURA PUBLICATION|Exercise Subjective Questions|51 Videos
PROBLEMS-4 MARKS
SURA PUBLICATION|Exercise Subjective Type Questions|20 Videos
THERMAL PHYSICS
SURA PUBLICATION|Exercise ADDITIONAL QUESTION & ANSWERS (HIGHER ORDER THINKING (HOTS) QUESTIONS)|4 Videos

Similar Questions

Explore conceptually related problems

A man uses a concave mirror for shaving. He keeps his face at a distance of 25 cm from the mirror and gets an image which is 1.4 times enlarged. Find the focal length of the mirror

An object of length 2.5 cm is placed at a distance of 1.5 f from a concave mirror where f is the magnitude of the focal length of the mirror. The length of the object is perpendicular to the principal axis. Find the length of the image. Is the image erect to inverted?

An object is kept at a distance of 60 cm from a concave mirror. For getting a magnification of (1)/(2) , Focal length of the concave mirror required is

An object 2.5 cm high is placed at a distance of 10 cm from a concave mirror of radius of curvature 30 cm. The size of the image is

A concave mirror forms an image of 20 cm high object on a screen placed 5.0 m away from the mirror. The height of the image is 50 cm. Find the focal length of the mirror and the distance between the mirror and the object.

An object is placed at a distance of 20.0 cm from a concave mirror of focal length 15.0 cm. (a) What distance from the mirror a screen should be placed to get a sharp image? (b) What is the nature of the image?

In a concave mirror experiment, an object is placed at a distance x, from, the focus and the image is formed at a distance x_2 from the focus. The focal length of the mirror would be

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

A point object is placed at a distance of 10cm and its real image is formed at a distance of 20 cm from a concave mirror. If the object is moved by 0.1 cm towards the mirror, the images will shift by about

SURA PUBLICATION-QUARTERLY MODEL QUESTION PAPER-Subjective Questions

Distinguish between cation and an anion.
Text Solution
|
Vinu dissolves 50 g of sugar in 250 ml of hot water, sarath dissolves ...
Text Solution
|
An object at a distance of 30 cm from a concave mirror gets its image ...
Text Solution
|
On analysing an impure sample of sodium chloride, the percentage of ch...
Text Solution
|
The angle of incidence for a ray of light having zero reflection angle...
Text Solution
|
Study of life in outer space is known as
Text Solution
|
A cricket ball of mass 25 g moving with a speed of 12 ms^(-1) is hit b...
Text Solution
|
Which of the following wavelengths will suffer maximum deviation while...
Text Solution
|
(i) An electric iron consumes energy at the rate of 420W when heating ...
Text Solution
|
Having two eyes facilitates in A : Increasing the field of view B : Br...
Text Solution
|
Sound travels faster in
Text Solution
|
The mass energy relation is the conclusion of
Text Solution
|
Why should the light dependent reaction occur before the light indepen...
Text Solution
|
How does an astronaut float in a space shuttle ?
Text Solution
|
State Snell's law.
Text Solution
|
Find the percentage of nitrogen in ammonia.
Text Solution
|
True or false. If false give the correct statement: (i) Ionic radius...
Text Solution
|
Which one of the following is not an amorphous substance?
Text Solution
|
Solar radiation is measured by
Text Solution
|
Who was the inventor of Radar?
Text Solution
|