Question

A doctor examines a mole with a 15.1 cm focal length magnifying glass held 11.4 cm from the mole How big is the image in millimeters if the mole is actually 4.2 mm in diameter?

What is the focal length of 2.4 D reading glasses found on the rack in a pharmacy?

How far, in centimeters from the lens must the film in a camera be, if the lens has a 36.3 mm focal length and is being used to photograph a flower 80.7 cm away?

A doctor examines a mole with a 13.3 cm focal length magnifying glass held 10.2 cm from the mole What's the magnification?

What is the power in diopters of a camera lens that has a 238.4 mm focal length?

You can determine the index of refraction of a substance by determining its critical angle. What is the index of refraction of a substance that has a critical angle of 61.7º when submerged in water (n = 1.333)?

At what minimum angle in degrees will you get total internal reflection of light when traveling from a medium of index of refraction of 1.56 to a medium with an index of refraction of 1.36.

The index of refraction of a substance is 1.42. What is the speed of light, in 10⁸ m/s, within the medium?

Suppose you have an unknown clear substance immersed in water (n=1.333), and you wish to identify it by finding its index of refraction. You arrange to have a beam of light enter it at an angle of 47.1º , and you observe the angle of refraction to be 27.5º . What is the index of refraction of the substance?

Suppose a ray of light going from air through crown glass (n=1.52) into water (n=1.333), such as going into a fish tank. Calculate the amount the ray is displaced by the glass ( Δx ) in cm, given that the incident angle is 39.2º and the glass is 0.94 cm thick.

A shopper standing 3.19 m from a convex security mirror sees his image with a magnification of 0.305. What is the focal length of the mirror?

What is the minimum height of a plane mirror in order for a 1.64 m person to see his or her entire reflection in that mirror?

A pair of reading classes has a power of +2.09 D. How far away from a piece of paper should it be so that sun light through the lens will set the paper on fire?

Components of some computers communicate with each other through optical fibers having an index of refraction n = 1.482. What time in nanoseconds is required for a signal to travel 0.283 m through such a fiber?

Answer 1