A concave mirror gives an image three ti...

A concave mirror gives an image three times as large as the object placed at a distance of 20 cm from it. For the image to be real, the focal length should be

5 cm

15 cm

20 cm

30 cm

Text Solution

Verified by Experts

The correct Answer is:

Topper's Solved these Questions

MOCK TEST - II
MCGROW HILL PUBLICATION|Exercise SAT|87 Videos
GENDER, RELIGION AND CASTE
MCGROW HILL PUBLICATION|Exercise HIGHER ORDER THINKING QUESTIONS|16 Videos
POWER SHARING AND FEDERALISM
MCGROW HILL PUBLICATION|Exercise HIGHER ORDER THINKING QUESTIONS|20 Videos

Similar Questions

Explore conceptually related problems

A spherical mirror forms a real image three times the linear size of the object. If the distance between the object and the image is 80 cm, the focal length of the mirror is

A concave mirror produces three times magnified real image of an object placed at 10 cm in front of it. Where is the image located ?

An object is placed at a distance of 40 cm in front of a concave mirror of focal length 20 cm. The image produced is

A concave mirror gives a real image magnifies 4 times. When the object is moved 3 cm the magnification of the real image is 3 times. Find the focal length of mirror.

For a concave mirror of focal length f, image is 2 times larger. Then the object distance from the mirror can be

An object is placed in front of a concave mirror at a distance of 7.5 cm from it. If the real image is formed at a distance of 30 cm from the mirror, find the focal length of the mirror. What would be the focal length if the image is virtual.

An object of height 1.2 m is placed before a concave mirror of focal length 20 cm so that a real image is formed at a distance of 60 cm from it. Find the position of the object ? What will be the height of image formed ?

MCGROW HILL PUBLICATION-MOCK TEST - II-SAT

If K.E. of a body increases by 0.1%, the percent increase in its momen...
Text Solution
|
Velocity of sound is maximum in
Text Solution
|
A concave mirror gives an image three times as large as the object pla...
Text Solution
|
An element 'A' reacts with oxygen to form a protective layer of compou...
Text Solution
|
The metal (M) forms an oxide M(2)O(3). The formula of its nitride will...
Text Solution
|
""^(35)Cland""^(37)Cl are the two isotopes of chlorine, in the ratio o...
Text Solution
|
Which one of the following statement is incorrect about graphite and d...
Text Solution
|
A compound 'x' reacts with a compound 'y' to produce a colourless and ...
Text Solution
|
Some ice pieces kept at a temperature -5^(@)C are heated gradually to ...
Text Solution
|
An atom (X) has an atomic number of 13 and a mass number of 27. How ma...
Text Solution
|
Which of the following would be the heaviest?
Text Solution
|
On heating blue coloured powder of copper nitrate in boiling tube, cop...
Text Solution
|
Baking soda on reaction with vinegar gives water plus two other produc...
Text Solution
|
Angle formed in minor segment of a circle is
Text Solution
|
The probability P(E) of any event E takes any value from
Text Solution
|
If p = 7+4sqrt3andpq=1, then (1/p^(2)+1/q^(2)) equals
Text Solution
|
Consider the following statements: when two straight lines intersect: ...
Text Solution
|
If one zero of the quadratic polynomial f(x)=4x^(2)-8kx-9 is negative ...
Text Solution
|
If m is a natural number, then 9^(2m)-4^(2m) is always divisible by
Text Solution
|
If cosectheta-sintheta=mandsectheta-costheta=n, then the value of (m^(...
Text Solution
|