Optics Answers

Two synchronized microwave sources, A and B, are emitting waves of wavelength 4.0 cm. Source A is located on the x-axis at x = 0, source B can be moved along the x-axis, and a microwave receiver is fixed on the x-axis at x = 84 cm. For each of the following positions of source B determine whether the waves from the sources will reach the receiver in phase (constructive interference), out of phase (destructive interference), or with a phase difference of π/2 rad.

(a) x = -8 cm.
(b) x = -6 cm.
(c) x = -5 cm.
(d) x = -4 cm.
(e) x = -3 cm.
(f) x = -2 cm.

Core refractive index -1.55
Cladding refractive index is 1.53wht is numerical aperture for optical fibre

A small convex mirror is placed 60 cm from the pole and on the axis of a large concave mirror of radius of curvature 200 cm.The position of the convex mirror is such that a real image of distant object is formed on the plane of a hole drilled through the concave mirror at its pole. Calculate ‘R’ of convex mirror and height of the real image if distant object forms 0.5 degree angle at the pole of the concave mirror.

A wave has frequency of 50 Hz and a wavelength of 2.3 m. What is the speed of the wave?

Polarizer and analyzer are set with their polarizing directions parallel, so the intensity
of transmitted light is maximum. Through what angle should either be turned, so that
intensity be reduced to 75% of the maximum intensity?

A convex lens of focal length 20 cm is placed after a slit of width 0.6 mm. If a plane wave of wavelength 600 nm falls normally on a slit, calculate the separation between the second minima on either side of the central maximum. Calculate the ratio of the intensity of the principal maximum to the first maximum on either side of the principal maximum.

A grating (with 15,000 lines per inch) is illuminated by sodium light. The grating spectrum is observed on the focal plane of a convex lens of focal length 10 cm. Calculate the separation between the D1 and D2 lines of sodium (The wavelengths of D1 and D2 lines are 589.0 and 589.6 nm respectively).

A hammer falls from a shelf and strikes the ground at 12 ms . Using kinetic
and potential energies in the calculation, determine what height did it fell from.

2 a place progressives' has the following equation y=5 sin (100fy t_0.4x) calculate (1)amplitude (2)angular velocity (3)wave length (4)frequency and period (5)linear velocity