Optics Answers

A diffraction phenomenon is observed using a double slit illuminated with light of wavelength 5000 °A. The slit with is 0.02mm and spacing between the two slit is 0.1mm. The distance of the screen from the slits is 100cm. Calculate
(1) distance between central maximum and first minimum of the fringes envelope.
(2) distance between any two consecutive double slit dark fringes
(3)amplitude and intensity.

A convex lens of power +5D was used to produce a virtual magnified image 5 times the size of the object. Determine the object and image position

An object is placed 6cm from a convex mirror of focal length 3cm. Find the image distance, its magnification and properties

Shine a flashlight through a clear drinking glass. Try to make a visible spectrum in the image made from the glass. If you can, note the conditions necessary for the spectrum to occur – specifically the distances or angles necessary.

When shining the light through the drinking glass, why was a spectrum not visible all of the
time? What factors would change whether a spectrum is visible, and why?

Color A and color B are sent through a prism. Color A is bent more than color B. which travels more rapidly in the prism?

A light beam undergoes total internal reflection at the interface between medium A, in which it propagates, and medium B, on the other side of the interface. Which medium has the greater index of refraction? Explain.

When color A and color B are sent through a prism, color A is bent more than color B. which color travels more rapidly in the prism? Explain.

The receiver for a dish antenna is placed in front of the concave surface of the dish. If the radius of curvature of the dish is R, how far in front of the dish should the receiver be placed? Explain.

7. At night a watchman shines a torch at a pool of water and observes a reflected spot of light on the opposite wall. The angle of depression of the torch and ray is 30o, and P, the point of reflection from the water surface, is 6 m from the wall.Calculate the distance h of the spot of light above the water

8. You are flying in a light aircraft at a speed of 39 ms-1. An eagle, whose speed is 18 ms-1, is flying directly toward you. Each of the given speeds is relative to the ground. The eagle emits a shrill cry whose frequency is 3400 Hz. What frequency do you hear? (Assume Speed of sound is 345 ms-1)
9. A man enters a tall tower and notes that a long pendulum extends from the ceiling to half the height of the building. If the height of the building is 60 m determine the period of oscillation?

Explain why the image was either upright or inverted when you shine a flashlight through a pinhole on a screen.