Recent content by leehom

Why do very large astronomical telescopes use a mirror rather than a lens for the objective optic?

Determine the time it takes for light to travel 54 cm through glycerine in an aquarium. Do I account for air, glycerine and glass?

So far, I've figured out that the object is placed at the focal point for the car headlight... and I'm guessing that the object in a solar oven would be beyond the centre of curvature

Here's the actual question: Concave mirrors are used in searchlights and solar ovens. Draw two diagrams to show the path of light in each case.

Both use concave mirrors... however; I'm not sure which one produces a virtual image and which one produces a real image??

Sorry.. should be sin 30 deg

Okay... but that doesn't help me solve di or do...

Dubbie is moving directly along a normal line toward a plain mirror at a speed of 3.5 m/s, what is the speed of the image relative to Dubbie? v Dubbie + v mirror = v image 3.5 m/s + 3.5 m/s = 7.0 m/s What is the speed of the image, relative to Dubbie, if Dubbie walk away from the...

Homework Statement The light from a star reflects from a concave mirror with a radius of curvature of 1.70 m. Determine how far the image of the star is from the surface of the mirror. Speed of light = 3.0 x 10^8 m/s r = 1.7 m f = 0.85 m 1/di + 1/do = 1/f... and then I'm stuck b/c...

Okay, thnx for your help

But the question specifically states that the incident angle is reduced by 8 deg

Would the focal length be equal to the object distance?

well... i wrote that the letters would have to "reversed" so that they would appear upright in the mirror according to prop. of images formed by a plane mirror... and another quick verification on this question: Light is shining on to a plane mirror at an angle of incidence of 27 deg. If...

but i still don't understand how that answers the question..

centre of curvature is half the focal point and the mirror equation is 1/di + 1/do = 1/f