This question about this image is in this simulation link: http://phet.colorado.

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This question about this image is in this simulation link: http://phet.colorado.edu/sims/geometric-optics/geometric-optics_en.html

"Geometric Optics" simulation. Be sure the "No Rays" Button is selected and the pencil is moved above the principal axis of the lens such that its eraser is positioned on the principal axis. Also make sure the radius of the curvature is set to 0.8 m, the refractive index is set at 1.5, and the diameter of the lens is set to 1.3 m. Also check the "Ruler" box

position the pencil 50 cm from the lens. Select the "principal rays" button and look at the image formed through the lens. select the "Virtual Omage" button. Using the ruler, determine the position of the image with respect to the lens. The image position from the lens is approximately

A. 180 cm.

B. 120 cm.

C. 140 cm.

D. 80 cm.

The magnification of the image is

A. –2.8.

B. +2.8.

C. –0.7.

D. +0.7.

Without changing the settings above, change the diameter of the lens from 1.3 m to 0.8 m. How does the image formed through the bigger lens change?

A. The image becomes bigger.

B. The image becomes smaller.

C. The image does not change.

Without changing the settings above, change the radius of curvature of the lens, first increasing its value and then decreasing its value (from the original one of 0.8 m). Does the image formed through the lens change?

A. yes

B. no

Explanation / Answer

The image position from the lens is approximately

C. 140cm

The magnification of the image is :

M= -v/u = -(-140)/50 = 2.8

Without changing the settings above, change the diameter of the lens from 1.3 m to 0.8 m. How does the image formed through the bigger lens change?

C. The image does not change.

Without changing the settings above, change the radius of curvature of the lens, first increasing its value and then decreasing its value (from the original one of 0.8 m). Does the image formed through the lens change?

A, Yes

After increasing ‘r’ image gets smaller and closer to the lens while after decreasing ‘r’ image gets bigger and farther from the lens.

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