{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

HW3 Sol Phys 375 F09

# HW3 Sol Phys 375 F09 - Phys 375 HW 3 Fall 2009 Due 5 6...

This preview shows pages 1–2. Sign up to view the full content.

Phys 375 HW 3 Fall 2009 Due 5 / 6 October, 2009 1. Imagine that you are standing 5 feet from, and looking directly toward, a brass ball 1 foot in diameter hanging in front of a pawn shop. State the type of image, position, magnification, and whether it is upright or inverted. Use the mirror equation 1/s o +1/s i = -2/R, with R = 0.5 ft. The sign convention for radius is negative here. 1/s i = -2/(0.5ft)-1/(5ft) so s i = -5/21 = -0.24 ft. M = -s i /s o = (- 0.24)/5 = 0.048. The image is virtual, erect, and 0.048 times the object size. 2 . Design a little dentist’s mirror to be fixed at the end of a shaft for use in the mouth of some happy soul. The requirements are (1) that the image be erect as seen by the dentist and (2) and that when held 1.5 cm from a tooth the mirror produces and image twice life- size. The mirror must be concave to produce an upright, virtual image. M = 2.0 = s i /0.015 m implies s i = -0.03 m. Putting into the mirror equation gives 1/f = 1/0.015- 1/0.03 so f = 0.03 m and R = 0.06 m. 3. A candle that is 6.00 cm tall is standing 10 cm from a thin diverging lens whose focal length is -30 cm.

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### Page1 / 3

HW3 Sol Phys 375 F09 - Phys 375 HW 3 Fall 2009 Due 5 6...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online