Light – Reflection and Refraction — Flashcards
Gujarat Board · Class 10 · Science
25 flashcards for Light – Reflection and Refraction (Gujarat Board Class 10 Science) to test yourself on key terms and facts.
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What are the two laws of reflection of light?
Answer
1. The angle of incidence is equal to the angle of reflection. 2. The incident ray, the normal to the mirror at the point of incidence, and the reflected ray all lie in the same plane.
Define: Principal focus of a concave mirror
Answer
The principal focus of a concave mirror is the point on the principal axis where parallel rays of light converge after reflection from the mirror. It is represented by the letter F.
What is the relationship between radius of curvature (R) and focal length (f) of a spherical mirror?
Answer
For spherical mirrors with small apertures: R = 2f This means the focal length is half the radius of curvature, and the principal focus lies midway between the pole and center of curvature.
What is the mirror formula? When is it used?
Answer
Mirror formula: 1/v + 1/u = 1/f Where: - v = image distance - u = object distance - f = focal length This formula is valid for all spherical mirrors and all object positions when using proper sign con…
How do you calculate magnification produced by a spherical mirror?
Answer
Magnification (m) = Height of image (h')/Height of object (h) = h'/h Also, m = -v/u Negative magnification indicates real and inverted image. Positive magnification indicates virtual and erect image.
Compare the image characteristics of concave and convex mirrors when object is at infinity.
Answer
Concave mirror: Image at focus F, highly diminished (point-sized), real and inverted. Convex mirror: Image at focus F (behind mirror), highly diminished (point-sized), virtual and erect.
What happens when an object is placed between the pole (P) and focus (F) of a concave mirror?
Answer
When object is between P and F of a concave mirror: - Image forms behind the mirror - Image is enlarged - Image is virtual and erect This is the only case where concave mirror forms virtual image.
Why are convex mirrors preferred as rear-view mirrors in vehicles?
Answer
Convex mirrors are preferred because: 1. They always give erect image (though diminished) 2. They have wider field of view due to outward curvature 3. They enable drivers to see much larger area than …
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