This question and the next question are based on the following information. A candle flame is 2 cm tall and is placed +30 cm from a converging lens. the image is at +45 cm. What is the focal length of the lens?   a. -90 cm   b. 18 cm   c. 90 cm   d. -18 cm

An object is placed 4cm left of a converging lens with a focal length of 10cm. a. Make a sketch of this arrangement and draw 3 principal rays to find where the image should form.   b. Is the image real or virtual? c. Use the thin lens equation to calculate the position of the image. d. (New situation) An object is placed 30 cm to the left of a diverging lens of focal length 20 cm. Sketch this arrangement by drawing 3 principal rays. Draw where you think the image should form

When a young girl looks in a 6.0-cm radius, spherical Christmas tree ornament, she sees an image of her face that is upright and four times smaller than its actual size. How close is her face to the ornament?   a. 9.0 cm   b. 7.0 cm   c. 5.0 cm   d. 8.0 cm   e. 6.0 cm

A positive lens has a focal length of 6cm. An object is located 18cm from the lens. a. how far from the lens is the image? b. is the image real or virtual, upright or inverted? c. trace three rays frin tge top if the object to confirm your results.

What is the power of a lens with 16cm focal length?  A. 1.50D B. 2.00D C. 2.50D D. 3.00D

A doctor examines a mole on the patient with a 17.2 cm focal length magnifying glass held 11.2 cm from the mole.  Describe the image the doctor sees. A.Real  B. Virtual  C. Inverted  D. Upright  E. Smaller than object F. Larger than object

Which of the following scenarios is a reasonable representation of a nearsighted person wearing proper corrective lenses?   A.Light passes through a concave lens and then another concave lens. B. Light passes through a convex lens and then a concave lens C.Light passes through a concave lens and then a convex lens D. light passes through a convex lens and then another convex lens

if an object with a height of 3 cm is imaged by an optical system with a magnification of -4, the image height will be?  a)-12 cm b)+12 cm

The angular magnification of a refracting telescope is 14. If the focal length of the objective lens is 70 cm, what is the distance between the object lens and the eyepiece?   a. 95 cm   b. 75 cm   c. 90 cm   d. 85 cm   e. 80 cm

What is the focal length (f) of a convex lens if the measured distance from the lens to the object = 30 cm and the distance to the image = 73.2 cm?     a. 15.1 cm   b. 103.2 cm   c. 21.3 cm   d. 2196 cm