A camera objective has an aperture diame...

A camera objective has an aperture diameter d . If the aperture is reduced to diameter `d//2` the exposure time under identical conditions of light should be made

`sqrt(2)` fold

2 fold

`2sqrt(2)` fold

4 fold

Text Solution

Verified by Experts

The correct Answer is:

Topper's Solved these Questions

NEET MOCK TEST 12
NTA MOCK TESTS|Exercise PHYSICS|45 Videos
NEET MOCK TEST 14
NTA MOCK TESTS|Exercise PHYSICS|45 Videos

Similar Questions

Explore conceptually related problems

A metallic sphere of diameter D has a cavity of diameter d at its centre. If the sphere is heated, the diameter of the cavity will:

Calculate the ratio of the mean free paths of the molecules of two gases having molecular diameters 1 A and 2 A . The gases may be considered under identical conditions of temperature, pressure and volume.

A lens haivng focal length and aperture of diameter d forms an image of intensity I . Aperture of diameter d/2 in central region of lens is covered by a black paper. Focal length of lens and intensity of image now will be respectively.

When diameter of the aperture of the objective of an astronomical telescope is increased, its

The camera lens has an aperture of f and the exposure time is (1/60)s. What will be the new exposure time if the aperture become 1.4f ?

Two rods made of same material having same length and diameter are joined in series. The thermal power dissipated through then is 2W.If they are joined in parallel, the thermal power dissipated under the same conditions on the two ends of the rods, will be :

A vessel filled with air under pressure p_0 contains a soap bubble of diameter d . The air pressure having been reduced isothermally n-fold , the bubble diameter increased eta-fold . Find the surface tension of the soap water solution.

A vessel filled with air under pressue p_(0) contains a soap bubble of diameter d . The air presuue have been reduced n -fold, and the bubbled diameter increased r -fold is othermally. Find the surface tension of the soap water solution.

NTA MOCK TESTS-NEET MOCK TEST 13-MCQs (PHYSICS)

If K(1) and K(2) are maximum kinetic energies of photoelectrons emitte...
Text Solution
|
In Uranium (Z=92), the K absorption edge is 0.107 Å and the K(alpha) l...
Text Solution
|
A camera objective has an aperture diameter d . If the aperture is red...
Text Solution
|
When an object is at distances x and y from a lens, a real image and a...
Text Solution
|
In the given circuit the average power developed is:
Text Solution
|
A current I = 10 sin (100pi t) amp. Is passed in first coil, which ind...
Text Solution
|
What will be the magnetic field at point P in the figure below?
Text Solution
|
The time of vibration of a dip needle in the vertical plane is 3 sec t...
Text Solution
|
If only one hundredth part of total current flowing in the circuit is ...
Text Solution
|
Separation between the plates of parallel plate capacitor is 5 mm. thi...
Text Solution
|
A capacitor of capacitance 100(mu)F is charged by connecting it to a b...
Text Solution
|
Positive charge q is given to each plate of a parallel plate air capac...
Text Solution
|
Which of the following statements is correct?
Text Solution
|
A 25 W, 220V bulb and 100W, 220V bulb are joined in series and connect...
Text Solution
|
A solid, uncharged conducting sphere of radius 3a contains a concentri...
Text Solution
|
Two point charges placed at a distance r in air exert a force f on eac...
Text Solution
|
The root-mean-square (rms) speed of oxygen molecules (O(2)) at a certa...
Text Solution
|
The pressure and volume of a given mass of gas at a given temperature ...
Text Solution
|
Four spheres A, B, C and D of different metals but all same radius are...
Text Solution
|
A man is standing between a stationary source and cliff. When he start...
Text Solution
|