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# focal length of plane mirror

Posted by: | Posted on: November 27, 2020

We have received your request successfully. Sobigger the circle gets the more its radius will be. Explain sign convention in mirror with the help of diagram. Focal length of plane mirror is (a) at infinity (b) zero (c) negative. The focal length of a plane mirror is infinite. Focal length of plane mirror is (a) at infinity (b) zero (c) negative (d) none of these, The radius of curvature and focal length of a concave mirror are (a) positive (b) negative (c) both (d) none of these, The object distance in both concave as well as convex mirror is (a) negative (b) positive (c) zero (d) none of these, Focal length of plane mirror is (a) at infinity (b) zero (c) negative, A mirror that has very wide field view is (a) concave (b) convex (c) plane (d) none of these. Focal length of a plane mirror is infinity. Focal length is defined as the distance from the centre of the mirror at which an incident parallel beam of light will converge. If an object is placed inside the focal length of a concave mirror, and enlarged virtual and erect image will be formed behind the mirror. 1 answer. Concave or Convex mirror thick or thin in the middle or edges. Focal length is half of radius of curvature and hence it is infinity. focal length is the length at which parallal rays vould converge. according to the laws of reflection for a plane mirror, the angle of incidence will be equal to the angle of reflection. So in the sameway as the curvature of the sphere gets less and less it view the full answer If it's a plane mirror, the light will not converge, so its undefined or infinite if u take in terms of limit. The focal length for a mirror is determined by the law of reflection from the mirror surface. A mirror that has very wide field view is (a) concave (b) convex (c) plane (d) none of these. (3) What is the focal length of a plane mirror? This point is called the focal point and the distance of this point from the center of the mirror is called the focal length of the mirror. The cartesian sign convention is used here. So a small part of length of circumference will behave like a plane mirror. Students (upto class 10+2) preparing for All Government Exams, CBSE Board Exam, ICSE Board Exam, State Board Exam, JEE (Mains+Advance) and NEET can ask questions from any subject and get quick answers by subject teachers/ experts/mentors/students. however in a plane mirror when two rys are parallel to the axis, they will strike the mirror at right angles. The distance along the optical axis from the mirror to the focal point is called the focal length of the mirror. CONSIDER PLANE MIRROR TO BE PART OF A CIRCLE OF INFINITE RADIUS. 1 answer. Solution: The radius of curvature of the mirror = 30 cm Thus, the focal length of the mirror =$$\frac { 30 cm }{ 2 }$$ = 15 cm. Draw a ray diagram and also state the position. (A plane mirror can be considered as a spherical mirror of infinite radius of curvature. When parallel rays fall on a mirror surface, they are brought to a point after reflection. In diagram, PF is the focal length of the mirror. I drew several chords of different lengths on the circle. An object is placed between infinity and the pole of a convex mirror. Focal length of a plane mirror is infinity. focal length is the length at which parallal rays vould converge. Example 4: An object is placed at a distance of 15 cm from a concave mirror of focal length 10 cm. Focal length is half of radius of curvature of the mirror. Solution: The radius of curvature of the mirror = 30 cm Thus, the focal length of the mirror =$$\frac { 30 cm }{ 2 }$$ = 15 cm. Our counselor will call to confirm your booking. therefore focal length = radius/2= infinity/2= infinity Example 4: An object is placed at a distance of 15 cm from a concave mirror of focal length 10 cm. asked Apr 2, 2019 in Physics by Farrah (69.5k points) light – reflection and refraction; cbse; class-10 ; 0 votes. Find the position of the image. Find the position of the image. The distance between the pole and the principal focus of the mirror, is called the focal length of the mirror. I was wondering whether there is a relation between the focal length and aperture of a spherical mirror (concave or convex). When parallel rays fall on a mirror surface, they are brought to a point after reflection. now radius of this circle is infinity. Welcome to Sarthaks eConnect: A unique platform where students can interact with teachers/experts/students to get solutions to their queries. Figure 2.3.2: (a) Parallel rays reflected from a parabolic mirror cross at a single point called the focal point F. (b) Parallel rays reflected from a large spherical mirror do not cross at a common point. Solution: We have u = –15 cm and f = –10 cm Focal length of plane mirror is  at infinity. The focal length of a plane mirror is infinite. Participate in learning and knowledge sharing. This law is not governed by the material that the mirror is made by. asked May 14 in Light by Annu01 (49.5k points) light; class-10; 0 votes. Offered for classes 6-12, LearnNext is a popular self-learning solution for students who strive for excellence. Solution: We have u = –15 cm and f = –10 cm however in a plane mirror when two rys are parallel to the axis, they will strike the mirror at right angles. Available for CBSE, ICSE and State Board syllabus. In a plane mirror, the radius of curvature is infinitly long, so the focus will be at infinity. I drew a circle on a piece of paper to represent a sphere of which the mirror forms a part. If The speed of light in vaccvum is 3×10 8.find the absolute refractive index of a medium in which light travels with a speed of 1.5× 10 8, Sample papers, board papers and exam tips. Move object outside focal length: Change to convex mirror: Ray diagrams for mirrors: Index Mirror concepts . Call our LearnNext Expert on 1800 419 1234 (tollfree) OR submit details below for a call back. You can use the mirror formula also to get the focal length of a plane mirror, where the image distance = − object distance.) It is represented by the symbol f. For mirrors of small aperture, f=R/2.