A man has recently replaced his 55” television, which utilized the old 4:3 ratio aspect. (A television’s size is measured along its diagonal.) He replaced it with a new 60” HDTV, in the new 16:9 aspect ratio. Does he now have more or less total square inches of viewing pleasure? Explain.

q44 What magnifying power is attained using a compound microscope with the following specifications: objective focal length 0.80 cm, eyepiece focal length 4.40 cm, tube length 15.0 cm? Assume a near point of 25.0 cm. Enter the numerical part of your answer to the nearest integer.

let aperture stop == radius of lens == object height

What is a megapixel in a digital camera?(a) A large spot on the detector where the image isfocused.(b) A special kind of lens that gives a sharper image.(c) A number related to how many photographs thecamera can store.(d) A million light-sensitive spots on the detector.(e) A number related to how fast the camera can takepictures.

A fish-tank has negligibly thin walls and a radius of 15 cm. Locate its focus relative to its walls when it is filled with water (nw = 4>3).