Term
| If amplitude is reduced ... |
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Definition
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Definition
| light slowed down by 1/4 wavelength |
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Definition
| ... rays that pass straight through unaffected by the medium |
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Term
| Direct rays are unaltered in amplitude and phase. |
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Definition
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Definition
| ... Rays that are bent because they are retarded by the medium. |
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Definition
| direct and diffracted rays are brought into exact phase with each other. |
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Definition
| ... 2 light waves of equal amplitude are in reverse phase => amplitudes will cancel each other to produce dark object. |
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Term
| The Zernike microscope differs from Brightfield in that: |
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Definition
1. different type of diphragm
2. phase plate |
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Term
| What does an annular stop do? |
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Definition
| Only allow a hollow cone of light to pass through the condenser to the specimen. |
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Term
| What does the phase plate do? |
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Definition
| It has a phase ring that advances or retards the direct light rays 1/4 wavelength. |
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Definition
| getting a brighter image resulting from the convergence of diffracted and direct rays on the image plane. |
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Term
| The image in a phase-contrast microscope will be 4 times brighter than with a Brightfield microscope. |
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Definition
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