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Crossword clues

Solve these clues to fill the grid.

The innermost light-sensitive membrane covering the back wall of the eyeball
1 Across
To increase in size, volume or significance
4 Across
What lets us see; the opposite of dark
6 Across
A small portable battery-powered electric lamp
7 Across
Not transmitting or reflecting light or radiant energy
8 Across
The transmission of light signals via glass fibers
10 Across
The organ of sight (plural)
11 Across
A brittle transparent solid with irregular atomic structure (plural)
13 Across
Shade within clear boundaries
15 Across
So thin as to ___ light
2 Down
An electrical device that alters the frequency spectrum of signals passing through it
3 Down
The amount of electromagnetic radiation leaving or arriving at a point on a surface
5 Down
One celestial body obscures another (plural)
9 Down
To pay close attention to one thing
10 Down
A circular segment of a curve
12 Down
Curved glass that bends light in glasses and cameras
14 Down

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