Optics Answers

An object, 0.04m high, is placed in front of and at right angles to the axis of a concave mirror which has radius of curvature 0.15m. if a real image 0.12m high is obtained, determine by scale drawing or otherwise, the distance of the object from the mirror.

How far, and in what direction, must the object be moved in order to obtain a virtual image 0.12m high?

A multimode step index fiber with a core diameter of 80 μm and a relative index difference of 1.5 % is

operating at a wavelength of 0.85 μm. If the core refractive index is 1.48, estimate the normalized

frequency for the fiber and number of guided modes.

• Compute the number of modes that will be 

supported by a fibre with core diameter of 20mm, a 

core refractive index of 1.5 and a cladding index of 

1.48 if it is excited by light of frequency 0.25MHz

A man stands 200 cm in front of a flat mirror. The vertical distance from his eyes to his toes is 165 cm. Find the distance from his eyes to the image of his toes.

For multimode step-index fiber with core index of 1.68 and radius of 35 um. The indexdifference is 3.75%. For a wavelength of 1150 nm, the optical power propagating incladding is what percentage of total power?(a) 2.1%(b) 2.5%(c) 1.8%(d) 1.4%​

Define reflection

A converging thin lens with 50cm focal lens forms area/image that is 2.5 times larger than the object. How Far is the object from the image.

Focal length of convex lens used for reading Hallmark916 on gold ornaments

Explain INTERFERENCE.

Polly has 50 rose bushes. She counts the number of flowers on 10 of them.

The number of flowers on each rose bush is:

9, 2, 5, 4, 12, 7, 8, 11, 9, 3

Find the standard deviation of the number of flowers on a rose bush. State your answer to 1 decimal place.