L2 DIFFRACTION GRATING I L1 LASER Dots on screen R1 I R2 ipcel.co.uk Here's a sketch of diffraction. A green laser pointer is shined through a diffraction grating and projecting the resulting pattern onto the screen. The angle marked in the figure is 15.4°. If the waves of the green laser light were 532 nm long, the spacing between the lines in the diffraction grating must have been.. O a. 0.0010 mm. O b.0.0020 mm O c. 0.0040 mm

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1
L2
DIFFRACTION
GRATING
I L1
LASER
Dots on
screen
R1
I R2
ipcel.co.uk
Here's a sketch of diffraction. A green laser pointer is shined through a diffraction grating and projecting the resulting pattern onto the screen. The angle
marked in the figure is 15.4°. If the waves of the green laser light were 532 nm long, the spacing between the lines in the diffraction grating must have been.
O a. 0.0010 mm.
O b.0.0020 mm
O . 0.0040 mm
Transcribed Image Text:L2 DIFFRACTION GRATING I L1 LASER Dots on screen R1 I R2 ipcel.co.uk Here's a sketch of diffraction. A green laser pointer is shined through a diffraction grating and projecting the resulting pattern onto the screen. The angle marked in the figure is 15.4°. If the waves of the green laser light were 532 nm long, the spacing between the lines in the diffraction grating must have been. O a. 0.0010 mm. O b.0.0020 mm O . 0.0040 mm
QUESTION 12
3
Little Hector takes his grandma's reading glasses outside to start a camp fire on a sunny day. If they have a refractive power of +2.5 diopters, how far from the
wood should he hold them to focus the suns light?
O a. 10 cm
O b. 25 cm
O C. 40 cm
O d. 2.5 cm
O e. None of these - reading glasses will diverge the light, preventing the light to focus.
Transcribed Image Text:QUESTION 12 3 Little Hector takes his grandma's reading glasses outside to start a camp fire on a sunny day. If they have a refractive power of +2.5 diopters, how far from the wood should he hold them to focus the suns light? O a. 10 cm O b. 25 cm O C. 40 cm O d. 2.5 cm O e. None of these - reading glasses will diverge the light, preventing the light to focus.
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