Question 1 :
A light ray travels at some angle (not head on) from water in a rectangular aquarium, through the glass side, and out into air . The indices if refraction for water, glass, and air are 1.33, about 1.6, and 1.0, respectively.<br/>Rank the material;s according to the angles of refraction&#160; made by the light ray with the normal in each, greatest first.

Question 2 :
Assertion: Critical angle of light passing from glass to air is minimum for violet color. Reason: The wavelength of blue light is greatest to the light of other colors.

Question 3 :
A ray of light incident on a lens parallel to its principal axis, after refraction passes through or appears to come from :

Question 4 :
A beam of parallel rays is brought to focus by a plano-convex lens. A thin concave lens of the same focal length is joined to the first lens. The effect of this is :

Question 5 :
When a wave travels from one medium to another, the quantity which will not change is its

Question 6 :
A ray of light travelling in air is incident on the plane of a transparent medium. The angle of incident is $45^0$ and that of refraction is $30^0$. The refractive index of the medium with respect to air is:

Question 8 :
A convex lens forms a real image of a point object placed on its principal axis. If the upper half of the lens is painted black<br>$(i)$The image will be shifted downward<br>$(ii)$The image will be shifted upward<br>$(iii)$The image will not be shifted<br>$(iv)$The intensity of the image will decrease

Question 9 :
In a plano-convex lens the radius of curvature of the convex lens is $10\ cm$. If the plane side is polished then the focal length will be (Refractive index $=1.5$)

Question 10 :
A ray of light suffers refraction throughequilateral prism. The deviation produced by theprism does not depend on the :

Question 11 :
The lateral shift in rectangular glass slab depends on which of the following properties of a medium ?<br>

Question 12 :
A luminous object is placed at a distance of 30 cm from the convex lens of focal length 20 cm.The distance from the lens a convex mirror of radius of curvature 10 cm should be placed on the other side of the lenssuch that the real images formed on the source itself is

Question 13 :
Magnification produced is +$\dfrac { 1 }{ 3 }$, then what kind of mirror it is?

Question 14 :
When a ray of light from air enters a denser medium, it:<br>

Question 15 :
A plano-convex lens with a radius of curvature $10$ cm and refractive index $1.5$ is pressed with another identical plano-convex lens so that a double convex lens is formed. &#160;The focal length of the resultant lens is :

Question 16 :
Two identical glass ($\mu_e=3/2$) lenses of focal length f each keeps in contact. The space between the two lenses is filled with water ($\mu_w=4/3$). The focal length of the combination is.

Question 17 :
Assertion: The formula connecting u, v and f for a spherical mirror is valid only for mirrors whose sizes are very small compared to their radii of curvature. Reason: Laws of reflection are strictly valid for plane surfaces, but not for large spherical surfaces.

Question 18 :
The plane face of a plano convex lens is silvered. If $\mu$ be the refractive index and R, the radius of curvature of curved surface, then system will behave like a concave mirror of curvature.

Question 19 :
A thin lens of focal length f has a diameter d of its aperture and forms an image of intensity &#160;I. Now the central part of the aperture up to a diameter&#160;$\dfrac{d}{2}$ is blocked by white paper. Then&#160;

Question 20 :
A microscope has an objective of focal length $1.5$ cm and an eyepiece of focal length $2.5 cm$. If the distance between objective and eyepiece is $20.5 cm$, what is the magnification produced when the final image is at infinite distance away?