Optics

Two thin lenses of power $+5\text{ D}$ and $-2\text{ D}$ are placed in contact coaxially. The focal length of the combination is:

Total internal reflection can take place only when a ray of light attempts to travel from:

An object at the bottom of a pond appears to be at a depth of $3\text{ m}$ to an observer looking normally from the air. If the refractive index of water is $4/3$, what is the actual depth of the pond?

Two thin lenses of power $+4\text{ D}$ and $-2\text{ D}$ are placed in contact coaxially. The focal length of the combination is:

Which of the following equations represents the Lens Maker's Formula for a lens of refractive index $\mu$ placed in air?

An object is placed at a distance of $2f$ from the optical center of a convex lens of focal length $f$. The nature and size of the image formed will be:

Which of the following is a primary advantage of a Cassegrain reflecting telescope over a refracting telescope?

In a compound microscope, the intermediate image formed by the objective lens is:

In the construction of an astronomical telescope, which of the following combinations for the focal length of the objective lens ($f_o$) and the eyepiece ($f_e$) is most appropriate?

What is the geometric relationship between a ray of light and the wavefront at any given point?

According to Huygens' Principle, each point on a primary wavefront acts as a source of secondary disturbance. These disturbances are known as:

The shape of the wavefront originating from a point source at a finite distance in a homogeneous isotropic medium is:

For constructive interference (a bright fringe) to occur at a point in the interference pattern, the path difference between the waves from the two slits must be an integral multiple of:

In Young's Double Slit Experiment, when white light is used to illuminate the slits, the central fringe observed on the screen is:

If the distance between the slits and the screen ($D$) is doubled while keeping the slit separation ($d$) and wavelength ($\lambda$) constant, the fringe width ($\beta$) will:

In the following experimental setup, unpolarized light from source S passes through a polarizer A and then an analyzer C. If the pass axis of polarizer A is vertical and the pass axis of analyzer C is horizontal, what will the detector D measure?

For a given wavelength of light, the diffraction effect is most pronounced when the size of the obstacle or slit is:

If the refractive index of a glass slab is $\sqrt{3}$, what is the polarizing angle ($i_p$) for the light incident on it?