### Focal Length Of Concave Mirror And Convex Lens Class 10th Science Lab Manual CBSE Solution

##### Question 1.What is a spherical mirror, give its type ?Answer:The spherical mirror is a part of a hollow sphere with one side having silver/mercury coating, further coated with paint to protect it from damage.It is of two types :1. Concave mirror: Silvered at the outer surface so that reflection takes place from the inner surface(concave).2. Convex mirror: Silver at inner surface so that reflection takes place from the outer surface(convex).Question 2.What is an aperture of the spherical mirror?Answer:It is the width of the reflecting surface from which reflection takes place.Question 3.what is centre and radius of curvature?Answer:, The centre of curvature, is the geometrical centre of the hollow sphere “c” from which the mirror is formed.The radius of curvature is the radius “R” of the hollow sphere whose part is a spherical mirror.Question 4.Define principal focus and axis?Answer:The Principal axis is the straight line joining the pole and centre of curvature.The principal focus is the point “f” on the parallel axis where a parallel beam of light actually meets after reflection.Question 5.Where is the brightest and sharpest image is formed by a concave mirror ?Answer:The brightest and the sharpest image for the concave mirror is formed at the focus.Question 6.Comment on the image formed by a concave mirror?Answer:1. Virtual, erect and enlarged image of an object is formed behind the concave mirror.2. The real and inverted image is formed in front of the mirror.Question 7.Why concave mirror is called a converging mirror?Answer:A concave mirror is called a converging mirror because it converges the parallel beam of light ray after reflection at a point.Question 8.Give two uses of the convex mirror?Answer:The uses of concave mirror are:1. They are reflectors in the torch to reflect the light rays.2. It is used as a shaving mirror to get an erect and enlarged image of the face.Question 9.What is the difference between a real and virtual image?Answer:A real image is obtained on the screen, they are formed by the interaction of a ray of light after reflection.A virtual image is formed when the ray of light appear to meet after the reflection; Image cannot be taken on the screen.Question 10.State law of reflection of light ?Answer:1. The angle incidence is equal to the angle of reflection.2. The incident ray, the reflected ray and the normal at the point of incidence,all lie on the same plane.Question 11.What is a lens?Answer:A homogenous transparent material or medium bounded by two surfaces at different or same radii of curvature is called a lens.Question 12.What are different types of lens?Answer:1. Double convex lens: if both the refracting surface is convex, it is thicker at the middle and thinner at the edges.2. Double concave lens: If both the refracting surface of the lens is concave, it is thinner at middle and thicker at the edges.Question 13.Write the lens formula?Answer:Lens formula: Where f is the focal length of the lensu is the distance between the object, and the lensv is the distance between the image and the lens.Question 14.Write the mirror formula?Answer:The mirror formula: Where f is the focal length of the mirrorv is the distance between the image and lensu is the distance between the object and the mirror.Question 15.When does a lens behave like a plane glass plate?Answer:The lens will behave like a plane glass only when it is kept in a medium whose refractive index is equal to that of the lens .Question 16.What is the way to increase the magnification power of a lens ?Answer:The magnification power of the lens can be increased by using a number of lenses.Question 17.Comment on the magnification sign for the concave and convex lens?Answer:1. Convex lens, magnification is positive for virtual image and negative for real image.2. Concave lens, magnification is always positive because virtual image is always formed.Question 18.What is the power of the lens?Answer:The power lens is the degree of convergence or divergence of the light ray incident on any refracting surface of the lens.Question 19.What is a factor the power of lens?Answer:the magnification power of the lens is inversely proportional to the focal length of the lens.Question 20.If we cover one half of the lens while focusing on a distant object, in what ways will it affect the image formed?Answer:A full-size image is formed, but only the intensity or brightness of the image will reduce.

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