Optics Answers

Two thin lenses of focal length f, and f, are in contact. The focal length f of the lens combination is given by

An object is placed at a fixed distance away from a screen and a converging lens is placed in between and closer to the object. When the lens is moved towards the screen, for two positions of the lens clear images are observed on the screen. If the height of these two images are h, and h, the height of the object is,

A certain prism is found to produce a deviation of 51°0', while it produces a deviation of 62°48' for two values of the angle of incidence namely 40°6' and 82°42' respectively. Determine the refracting angle of the prism, the angle of incidence at minimum deviation and the refractive index of the material of the prism.

If the sun is 150 million km away from the earth, how long does it take sunlight to reach the earth

The focal length of a plano-convex glass lens is 20cm muo of glass =1.5. The plane face of it is silvered. An illuminating object is placed at a distance of 60cm from the lens on its axis along the convex side. Then the distance of the image in cm is

Derive an expression to show that the condition
Of population inversion is necessary for laser action?

A coin lies at the bottom of a tank containing water to a depth of 130cm. If the refractive index is 1.3. Calculate the apparent depth of the coin.

I need to magnify a very small image (let's say 2mm in diameter) to something around 6" in diameter. I will be making my lens or lenses but not sure what curvature, thickness or radius I need. The distance from the image can be anything. The max thickness of the material is 45 mm. The material will be acrylic. The refractive index and extinction coefficient at 632.8 nm are 1.489 and 0.000.

The critical angle for total internal reflection at an air - water interface is approximately 48 degrees. In which of the following situations will total reflection occurs?

Calculate the critical angle for light passing from rock salt into air given that the refractive index of rock salt is 1.54