A convex mirror is used to reflect light from an object placed 30 cm in front of the mirror. If the focal length of the mirror is 20 cm then the location of the image should be

โˆ’27 cm
โˆ’37 cm
โˆ’29 cm
โˆ’47 cm
โˆ’27 cm  

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The endoscope used to examine the bladder is called
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B. beyond 2F
C. at F
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The iris has an opening at its center which is called
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C. retina
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A. regular reflection
B. irregular reflection
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C. concave mirror
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Water separates the colors of sunlight into a rainbow due to
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