Mock Test 1 — Optics

Image formed by a plane mirror is:

A convex lens of $f = 20$ cm is used to view an object placed $10$ cm away. The image is:

Refractive index of medium where speed of light is $2 \times 10^8$ m/s:

The critical angle for diamond ($n = 2.42$) is approximately:

In YDSE, the maximum number of bright fringes formed on a screen of width $W$ (with slit separation $d$, wavelength $\lambda$):

Two coherent sources of equal intensity superpose. Ratio of maximum to minimum intensity:

The polarizing angle for a medium:

A converging lens of $f = 10$ cm; object at $20$ cm. Image distance:

Two slits in YDSE are illuminated by light of wavelengths $400$ nm and $600$ nm. Position of first coincidence of bright fringes from centre (in terms of $\lambda$):

Power of a lens of focal length $25$ cm:

A prism of $A = 60°$, minimum deviation $30°$. The refractive index $n$ to two decimal places, then multiplied by $100$ (rounded integer):

In YDSE: $d = 0.5$ mm, $D = 1$ m, $\lambda = 500$ nm. Fringe width in mm:

An object of $4$ cm is placed $30$ cm from a concave mirror of $f = 15$ cm. Image height (magnitude in cm, integer):

Assertion (A): A convex mirror is used as a rear-view mirror in vehicles. Reason (R): It produces a virtual, erect, diminished image with a wide field of view.

Assertion (A): Two independent sources cannot produce sustained interference. Reason (R): They emit light of different frequencies and have random phase difference.