Select the choice below that best defines an image. Select One of the Following:

Question

Select the choice below that best defines an image. Select One of the Following: You want to build a search light. The search light is to have an outgoing parallel beam. You have a small, very bright light (a point light source) and a concave mirror with radius of curvature 2m. How far from the mirror should the point light source be placed so the mirror produces an outgoing parallel beam? Select One of the Following: You can purchase a large concave mirror off the internet for $180. The mirror has a focal length of 21in. What is the radius of curvature of their mirror? Select One of the Following: A convex mirror has a radius of curvature of magnitude |T| = 50cm. An object is 20cm from the mirror. Compute the image distance. Select One of the Following:

Explanation / Answer

(15.1) option(b) is correct

(15.2)Radius of cruvature R = 2m

Focal length f = R/2

                     = 1m

If the object is placed at infinity then the image is formed at focal point.

So, answer is f i.e., 1 m

(15.3).Focalelngth f = 21 in

Radius of curvature R = 2f = 42 in

(15.4) Radius of curvature R = 50 cm

Focal length of convex mirror f = -R/2 = -25 cm

Object distance u = 20 cm

Image distance v = ?

From the relation(1/v) +(1/u) = (1/f)

(1/v) = (1/f) -( 1/ u)

       = (1/-25) -(1/20)

       = -0.04 -0.05

       = -0.09

   v = -11.11 cm

      = -11 cm

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