The separation between the screen and a concave mirror is 2 r : A… - Vidyadip

MCQ

The separation between the screen and a concave mirror is $2 r$ : An isotropic point source of light is placed exactly midway between the mirror and the point source. Mirror has a radius of curvature $r$ and reflects $100 \%$ of the incident light. Then the ratio of illuminances on the screen with and without the mirror is

A
$10: 1$
✓
$2: 1$
C
$10: 9$
D
$9: 1$

✓

Answer

Correct option: B.

$2: 1$

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "MCQ" from Ray Optics→Ray Optics — all question types→JEE physics STD 12 Science question papers→CBSE Board STD 12 Science question papers→CBSE Board question paper generator→

Similar questions

A beam with wavelength $\lambda$ falls on a stack of partially reflecting planes with separation $d$. The angle $\theta$ that the beam should make with the planes so that the beams reflected from successive planes may interfere constructively is (where $n=1,2, \ldots .$. )

Mark the wrong statement

During an isothermal expansion of an ideal gas

The Young's modulus of a rubber string $8 cm$ long and density $1.5 kg / m ^3$ is $5 \times 10^8 N / m ^2$, is suspended on the ceiling in a room. The increase in length due to its own weight will be

A weight lifter lifts $300 \mathrm{~kg}$ from the ground to a height of 2 meter in 3 second. The average power generated by him is

Two stones of different masses are dropped simultaneously from the top of a building

A particle of mass $10 grams$ is executing simple harmonic motion with an amplitude of $0.5 m$ and periodic time of $(\pi / 5)$ seconds. The maximum value of the force acting on the particle is

In the circuit, the reading of the ammeter is (assume internal resistance of the battery be zero)

A cart of mass $M$ is tied by one end of a massless rope of length $ 10 m$. The other end of the rope is in the hands of a man of mass $M$. The entire system is on a smooth horizontal surface. The man is at $x =0$ and the cart at $x=10 m$. If the man pulls the cart by the rope, the man and the cart will meet at the point

A motorcycle is going on an overbridge of radius $R$. The driver maintains a constant speed. As the motorcycle is ascending on the overbridge, the normal force on it