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parallel light rays from a distant object incident on a device X form a point size image on a screen. the device X must be (1) covex lens (b) concave mirror (3) cocave lens (4) either a concave mirror or convex lens

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The correct answer would be (4) either a concave mirror or a convex lens
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(4) Either concave mirror or convex lens 
   
  Because it is not mentioned whether the screen is kept in front of the device x or behind it ..
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(b) Concave mirror
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(4)either a concave mirror or convex lens
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 ans Should be (4) Either a concave mirror or convex lens as both of them form real and inverted image. Real image can be captured on the screen.
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